diff --git a/src/app/components/creator/content-choice-creator/content-choice-creator.component.html b/src/app/components/creator/content-choice-creator/content-choice-creator.component.html
index 236216731a7d7ac9545b3039f07b15926ea9693f..1d90657e7a255d33db528e0e88576ae02754e6ba 100644
--- a/src/app/components/creator/content-choice-creator/content-choice-creator.component.html
+++ b/src/app/components/creator/content-choice-creator/content-choice-creator.component.html
@@ -50,8 +50,8 @@
       <mat-icon class="addIcon">add_box</mat-icon>
     </button>
   </div>
-  <div fxLayout="row" fxLayoutAlign="center" fxLayoutGap="25px">
-    <button mat-raised-button class="create" type="submit">{{ 'content.create' | translate }}</button>
+  <div fxLayout="row" fxLayoutAlign="center" fxLayoutGap="20px">
     <button mat-raised-button class="reset" (click)="reset($event)">{{ 'content.reset' | translate }}</button>
+    <button mat-raised-button class="create" type="submit">{{ 'content.create' | translate }}</button>
   </div>
 </form>
diff --git a/src/app/components/creator/content-likert-creator/content-likert-creator.component.html b/src/app/components/creator/content-likert-creator/content-likert-creator.component.html
index feecd6014a4e081262bc1b1d7620f747210417cb..7caf6c9ddec6441384c4ae666502ce63e331f9ba 100644
--- a/src/app/components/creator/content-likert-creator/content-likert-creator.component.html
+++ b/src/app/components/creator/content-likert-creator/content-likert-creator.component.html
@@ -10,7 +10,7 @@
     <mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
     <mat-row *matRowDef="let row; columns: displayedColumns;"></mat-row>
   </mat-table>
-  <div>
+  <div fxLayout="row" fxLayoutAlign="center">
     <button mat-raised-button type="submit"class="submit">{{ 'content.create' | translate }}</button>
   </div>
 </form>
diff --git a/src/app/components/creator/content-likert-creator/content-likert-creator.component.scss b/src/app/components/creator/content-likert-creator/content-likert-creator.component.scss
index 4b6e92c0b8df802c07e7c0f5988113e281894fd1..051ec35e599f1025c913dbac28d5e56a8aabd1e9 100644
--- a/src/app/components/creator/content-likert-creator/content-likert-creator.component.scss
+++ b/src/app/components/creator/content-likert-creator/content-likert-creator.component.scss
@@ -11,6 +11,11 @@ mat-cell {
 }
 
 .submit {
+  margin-top: 80px;
   background-color: var(--primary);
   color: var(--on-primary);
 }
+
+.mat-raised-button {
+  min-width: 120px;
+}
diff --git a/src/app/components/creator/content-list/content-list.component.html b/src/app/components/creator/content-list/content-list.component.html
index 058925e146d34a131d3e10c98d76b5409a4c7422..e6dc728eec0e1c8387b7a4b79504c4a11afa227b 100644
--- a/src/app/components/creator/content-list/content-list.component.html
+++ b/src/app/components/creator/content-list/content-list.component.html
@@ -6,11 +6,6 @@
       </mat-card-title>
     </mat-card-header>
     <mat-divider></mat-divider>
-    <div *ngIf="isLoading" fxLayout="column" fxLayoutAlign="center" fxLayoutGap="20px" fxFill>
-      <div fxLayout="row" fxLayoutAlign="center">
-        <mat-progress-spinner mode="indeterminate"></mat-progress-spinner>
-      </div>
-    </div>
     <mat-grid-list cols="3" rowHeight="1:1">
       <mat-grid-tile>
         <button class="actionButton" mat-icon-button
@@ -36,10 +31,15 @@
     </mat-grid-list>
     <mat-divider></mat-divider>
     <mat-card-content>
+      <div *ngIf="isLoading" fxLayout="column" fxLayoutAlign="center">
+        <div fxLayout="row" fxLayoutAlign="center">
+          <mat-progress-spinner mode="indeterminate" diameter="50"></mat-progress-spinner>
+        </div>
+      </div>
       <mat-expansion-panel *ngFor="let content of contents; index as i" class="matPanel">
         <mat-expansion-panel-header class="matPanelListHeader">
           <mat-panel-title class="panelTitle">
-              {{ labels[i] }}
+            {{ labels[i] }}
           </mat-panel-title>
           <button mat-icon-button color="accent" (click)="editContent(content);$event.stopPropagation();"
                   class="editButton">
diff --git a/src/app/components/creator/content-list/content-list.component.scss b/src/app/components/creator/content-list/content-list.component.scss
index 5945fe3f55e871158a8f1f210c2c534949c681a3..d48250df0010d3f13cd64deb5d646d6a994cdedf 100644
--- a/src/app/components/creator/content-list/content-list.component.scss
+++ b/src/app/components/creator/content-list/content-list.component.scss
@@ -76,3 +76,7 @@ mat-tooltip-component {
   width: 50px;
   line-height: 100%!important;
 }
+
+mat-progress-spinner {
+  margin-top: 10px;
+}
diff --git a/src/app/components/creator/content-list/content-list.component.ts b/src/app/components/creator/content-list/content-list.component.ts
index 53651c3b8e24cc80707750d6cc2da2455efc6ac9..55392ff27edf59d58e59ade3e592f98729b15e78 100644
--- a/src/app/components/creator/content-list/content-list.component.ts
+++ b/src/app/components/creator/content-list/content-list.component.ts
@@ -65,14 +65,13 @@ export class ContentListComponent implements OnInit {
           this.labels[i] = this.contents[i].subject;
         }
       }
-
+      this.isLoading = false;
     });
     this.route.params.subscribe(params => {
       sessionStorage.setItem('collection', params['contentGroup']);
       this.collectionName = params['contentGroup'];
     });
     this.translateService.use(localStorage.getItem('currentLang'));
-    this.isLoading = false;
   }
 
   findIndexOfSubject(subject: string): number {
diff --git a/src/app/components/creator/content-presentation/content-presentation.component.html b/src/app/components/creator/content-presentation/content-presentation.component.html
index c2e6ac40eb4e4fccdffe554f04394f39127d84f2..7ce0116d5efcc2eb8fada4e7c88e0a3204ca4d44 100644
--- a/src/app/components/creator/content-presentation/content-presentation.component.html
+++ b/src/app/components/creator/content-presentation/content-presentation.component.html
@@ -1,3 +1,9 @@
+<div *ngIf="isLoading" fxLayout="column" fxLayoutAlign="center" fxFill>
+  <div fxLayout="row" fxLayoutAlign="center">
+    <mat-progress-spinner color="primary" mode="indeterminate"></mat-progress-spinner>
+  </div>
+</div>
+
 <div fxLayout="column" fxLayoutAlign="start center">
   <mat-tab-group>
       <mat-tab fxLayoutAlign="center" *ngFor="let content of contents" label="{{content.subject}}">
diff --git a/src/app/components/creator/content-presentation/content-presentation.component.ts b/src/app/components/creator/content-presentation/content-presentation.component.ts
index e070286e496cd177d51ca4223ce25bfb17d95556..5abca04318f8e8d74cbd6ce9e95b579934ac1e49 100644
--- a/src/app/components/creator/content-presentation/content-presentation.component.ts
+++ b/src/app/components/creator/content-presentation/content-presentation.component.ts
@@ -13,6 +13,7 @@ export class ContentPresentationComponent implements OnInit {
   contents: ContentChoice[];
   contentGroup: ContentGroup;
   labels = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H'];
+  isLoading = true;
 
   constructor(private contentService: ContentService) {
   }
@@ -21,6 +22,7 @@ export class ContentPresentationComponent implements OnInit {
       this.contentGroup = JSON.parse(sessionStorage.getItem('contentGroup'));
       this.contentService.getContentChoiceByIds(this.contentGroup.contentIds).subscribe( contents => {
         this.contents = contents;
+        this.isLoading = false;
       });
   }
 
diff --git a/src/app/components/creator/content-text-creator/content-text-creator.component.html b/src/app/components/creator/content-text-creator/content-text-creator.component.html
index d9a776aea364e5547a90dccf135fbab779022769..2eae0303e27a9e8c160f6c3bedb40360a0123b80 100644
--- a/src/app/components/creator/content-text-creator/content-text-creator.component.html
+++ b/src/app/components/creator/content-text-creator/content-text-creator.component.html
@@ -1,5 +1,5 @@
 <form (ngSubmit)="submitContent()">
-  <div fxLayout="row" fxLayoutAlign="center" fxLayoutGap="5px">
+  <div fxLayout="row" fxLayoutAlign="center">
     <button mat-raised-button type="submit" class="submit">{{'content.create' | translate}}</button>
   </div>
 </form>
diff --git a/src/app/components/creator/content-text-creator/content-text-creator.component.scss b/src/app/components/creator/content-text-creator/content-text-creator.component.scss
index 3eb278fae9f3ee459aff8278e0a0df2bb128711d..bb06a964f1b1ee6e391892ea8af40c1ff7880c9d 100644
--- a/src/app/components/creator/content-text-creator/content-text-creator.component.scss
+++ b/src/app/components/creator/content-text-creator/content-text-creator.component.scss
@@ -3,6 +3,11 @@ form > button {
 }
 
 .submit {
+  margin-top: 180px;
   background-color: var(--primary);
   color: var(--on-primary);
 }
+
+.mat-raised-button {
+  min-width: 120px;
+}
diff --git a/src/app/components/creator/content-yes-no-creator/content-yes-no-creator.component.html b/src/app/components/creator/content-yes-no-creator/content-yes-no-creator.component.html
index dd2647f880e0105e06eaa1463d44677e487973c0..cd1a5358556f8d94bd509f1b1418abe1bfeb81fa 100644
--- a/src/app/components/creator/content-yes-no-creator/content-yes-no-creator.component.html
+++ b/src/app/components/creator/content-yes-no-creator/content-yes-no-creator.component.html
@@ -7,7 +7,7 @@
       {{ 'content.no' | translate }}
     </mat-radio-button>
   </mat-radio-group>
-  <div>
+  <div fxLayout="row" fxLayoutAlign="center" fxLayoutGap="25px">
     <button mat-raised-button type="submit" class="submit">{{ 'content.create' | translate }}</button>
   </div>
 </form>
diff --git a/src/app/components/creator/content-yes-no-creator/content-yes-no-creator.component.scss b/src/app/components/creator/content-yes-no-creator/content-yes-no-creator.component.scss
index 3eb278fae9f3ee459aff8278e0a0df2bb128711d..0047e966a4654204184c48c75cd3611bdf3fc440 100644
--- a/src/app/components/creator/content-yes-no-creator/content-yes-no-creator.component.scss
+++ b/src/app/components/creator/content-yes-no-creator/content-yes-no-creator.component.scss
@@ -5,4 +5,9 @@ form > button {
 .submit {
   background-color: var(--primary);
   color: var(--on-primary);
+  margin-top: 160px;
+}
+
+.mat-raised-button {
+  min-width: 120px;
 }
diff --git a/src/app/components/creator/home-creator-page/home-creator-page.component.html b/src/app/components/creator/home-creator-page/home-creator-page.component.html
index b6d80569da72ba0f390b1cd7f604548eaf1940f8..fb8fa396a107d4f768b4d7be01abd84592cb649a 100644
--- a/src/app/components/creator/home-creator-page/home-creator-page.component.html
+++ b/src/app/components/creator/home-creator-page/home-creator-page.component.html
@@ -1,6 +1,8 @@
 <div fxLayout="column" fxLayoutAlign="start" fxLayoutGap="20px" fxFill>
   <div fxLayout="row" fxLayoutAlign="center" fxLayoutGap="5px">
-    <button mat-raised-button (click)="openCreateRoomDialog()">{{ 'home-page.create-session' | translate }}</button>
+    <button mat-raised-button (click)="openCreateRoomDialog()">
+      <mat-icon>add</mat-icon>
+      {{ 'home-page.create-session' | translate }}</button>
   </div>
   <div fxLayout="row" fxLayoutAlign="center">
     <app-room-list></app-room-list>
diff --git a/src/app/components/creator/room-creator-page/room-creator-page.component.html b/src/app/components/creator/room-creator-page/room-creator-page.component.html
index e7bc4b5095040b4609ce613a9802218a565d5494..41c0b339653cb87571ca8fe3cecebe5a3308e4a9 100644
--- a/src/app/components/creator/room-creator-page/room-creator-page.component.html
+++ b/src/app/components/creator/room-creator-page/room-creator-page.component.html
@@ -1,6 +1,6 @@
 <div fxLayout="column" fxLayoutAlign="center" fxLayoutGap="20px" fxFill>
   <div fxLayout="row" fxLayoutAlign="center">
-    <mat-progress-spinner *ngIf="isLoading" color="accent" mode="indeterminate"></mat-progress-spinner>
+    <mat-progress-spinner *ngIf="isLoading" color="primary" mode="indeterminate"></mat-progress-spinner>
     <mat-card *ngIf="room">
       <div fxLayout="row">
         <span class="fill-remaining-space"></span>
@@ -31,13 +31,6 @@
         </mat-expansion-panel>
       </mat-card-content>
       <mat-grid-list cols="2" rowHeight="2:1">
-        <mat-grid-tile colspan="1" rowspan="1">
-          <button mat-icon-button
-                  routerLink="/creator/room/{{ room.shortId }}/create-content">
-            <mat-icon>note_add</mat-icon>
-            <h3 *ngIf="deviceType === 'desktop'">{{ 'room-page.create-content' | translate}}</h3>
-          </button>
-        </mat-grid-tile>
         <mat-grid-tile>
           <button mat-icon-button
                   routerLink="/creator/room/{{ room.shortId }}/comments">
@@ -45,19 +38,26 @@
             <h3 *ngIf="deviceType === 'desktop'">{{ 'room-page.comments' | translate}}</h3>
           </button>
         </mat-grid-tile>
+        <mat-grid-tile>
+          <button mat-icon-button routerLink="/creator/room/{{ room.shortId }}/feedback-barometer">
+            <mat-icon class="smallerIcon">thumbs_up_down
+            </mat-icon>
+            <h3 *ngIf="deviceType === 'desktop'">{{ 'room-page.live-feedback' | translate}}</h3>
+          </button>
+        </mat-grid-tile>
       </mat-grid-list>
       <mat-grid-list cols="2" rowHeight="2:1">
         <mat-grid-tile>
-          <button mat-icon-button routerLink="/creator/room/{{ room.shortId }}/statistics">
-            <mat-icon>insert_chart</mat-icon>
-           <h3 *ngIf="deviceType === 'desktop'">{{ 'room-page.answer-statistics' | translate}}</h3>
+          <button mat-icon-button
+                  routerLink="/creator/room/{{ room.shortId }}/create-content">
+            <mat-icon>note_add</mat-icon>
+            <h3 *ngIf="deviceType === 'desktop'">{{ 'room-page.create-content' | translate}}</h3>
           </button>
         </mat-grid-tile>
         <mat-grid-tile>
-          <button mat-icon-button routerLink="/creator/room/{{ room.shortId }}/feedback-barometer">
-            <mat-icon class="smallerIcon">thumbs_up_down
-            </mat-icon>
-            <h3 *ngIf="deviceType === 'desktop'">{{ 'room-page.live-feedback' | translate}}</h3>
+          <button mat-icon-button routerLink="/creator/room/{{ room.shortId }}/statistics">
+            <mat-icon>insert_chart</mat-icon>
+           <h3 *ngIf="deviceType === 'desktop'">{{ 'room-page.answer-statistics' | translate}}</h3>
           </button>
         </mat-grid-tile>
       </mat-grid-list>
diff --git a/src/app/components/participant/content-choice-participant/content-choice-participant.component.html b/src/app/components/participant/content-choice-participant/content-choice-participant.component.html
index bbe19ad9690da554b8be85350df08895dfdd4e64..7d252fd369888e113d9827df327bf76b1f0f9897 100644
--- a/src/app/components/participant/content-choice-participant/content-choice-participant.component.html
+++ b/src/app/components/participant/content-choice-participant/content-choice-participant.component.html
@@ -19,7 +19,7 @@
   </mat-radio-group>
   <mat-divider></mat-divider>
   <div fxLayoutAlign="center" fxLayoutGap="20px" fxAlign="row">
-    <button mat-raised-button [disabled]="alreadySent" type="submit" color="accent">{{ 'answer.submit' | translate }}</button>
-    <button mat-raised-button [disabled]="alreadySent" (click)="abstain($event)" color="primary">{{ 'answer.abstain' | translate }}</button>
+    <button mat-raised-button class="abstain" [disabled]="alreadySent" (click)="abstain($event)">{{ 'answer.abstain' | translate }}</button>
+    <button mat-raised-button class="submit" [disabled]="alreadySent" type="submit">{{ 'answer.submit' | translate }}</button>
   </div>
 </form>
diff --git a/src/app/components/participant/content-choice-participant/content-choice-participant.component.scss b/src/app/components/participant/content-choice-participant/content-choice-participant.component.scss
index 81c1f2bc4cd81f9ee99c59f6ddf3ed2ea76d8165..f091afe27c1c243c63343c6d768ed00d0a1a64e9 100644
--- a/src/app/components/participant/content-choice-participant/content-choice-participant.component.scss
+++ b/src/app/components/participant/content-choice-participant/content-choice-participant.component.scss
@@ -10,3 +10,13 @@ form > h1 {
   margin:20px 0;
   font-size: larger;
 }
+
+.submit {
+  background-color: var(--primary);
+  color: var(--on-primary);
+}
+
+.abstain {
+  background-color: var(--secondary);
+  color: var(--on-secondary);
+}
diff --git a/src/app/components/participant/participant-content-carousel-page/participant-content-carousel-page.component.html b/src/app/components/participant/participant-content-carousel-page/participant-content-carousel-page.component.html
index 6ca94819f174e020ac88b6f051b0427f4d65b492..704deaf2504c9fe6457929ae0108381d05369836 100644
--- a/src/app/components/participant/participant-content-carousel-page/participant-content-carousel-page.component.html
+++ b/src/app/components/participant/participant-content-carousel-page/participant-content-carousel-page.component.html
@@ -1,3 +1,9 @@
+<div *ngIf="isLoading" fxLayout="column" fxLayoutAlign="center" fxFill>
+  <div fxLayout="row" fxLayoutAlign="center">
+    <mat-progress-spinner color="primary" mode="indeterminate"></mat-progress-spinner>
+  </div>
+</div>
+
 <div fxLayout="column" fxLayoutAlign="start center">
   <mat-tab-group>
     <mat-tab *ngFor="let content of contents" label="{{content.subject}}">
diff --git a/src/app/components/participant/participant-content-carousel-page/participant-content-carousel-page.component.ts b/src/app/components/participant/participant-content-carousel-page/participant-content-carousel-page.component.ts
index 5959d3cebd7201c9f28e54a5ffa956e3b0ec277b..b792cd9c17b805a7272c5ae5520d2cbf44494297 100644
--- a/src/app/components/participant/participant-content-carousel-page/participant-content-carousel-page.component.ts
+++ b/src/app/components/participant/participant-content-carousel-page/participant-content-carousel-page.component.ts
@@ -14,6 +14,7 @@ export class ParticipantContentCarouselPageComponent implements OnInit {
 
   contents: Content[];
   contentGroup: ContentGroup;
+  isLoading = true;
 
   constructor(private contentService: ContentService) {
   }
@@ -22,6 +23,7 @@ export class ParticipantContentCarouselPageComponent implements OnInit {
       this.contentGroup = JSON.parse(sessionStorage.getItem('contentGroup'));
       this.contentService.getContentsByIds(this.contentGroup.contentIds).subscribe( contents => {
         this.contents = contents;
+        this.isLoading = false;
       });
   }
 }
diff --git a/src/app/components/shared/comment-list/comment-list.component.html b/src/app/components/shared/comment-list/comment-list.component.html
index 137d1da26b1ce13fb400438f11dd0b51406c48e9..306fe5587e2648e792e35bda0996f8779d7bb71e 100644
--- a/src/app/components/shared/comment-list/comment-list.component.html
+++ b/src/app/components/shared/comment-list/comment-list.component.html
@@ -1,8 +1,8 @@
-<div fxLayout="row" id="search-container">
+<div fxLayout="row" id="search-container" *ngIf="!isLoading">
   <mat-label fxLayoutAlign="center center">
     <mat-icon class="search-icon">search</mat-icon>
   </mat-label>
-  <input #searchBox placeholder="{{ 'comment-list-page.search' | translate }}"
+  <input #searchBox placeholder="{{ 'comment-list.search' | translate }}"
     (input)="searchComments(searchBox.value)">
   <button mat-icon-button class="searchBarButton close" *ngIf="searchBox.value"
           (click)="hideCommentsList=false; searchBox.value=''">
@@ -13,16 +13,17 @@
 
   <div class="button-bar" fxLayoutAlign="center center">
     <button mat-icon-button class="searchBarButton" *ngIf="!searchBox.value && userRole === 1 && comments.length > 0"
-            [matTooltip]="'Export comments'" (click)="openExportDialog()">
+            matTooltip="{{ 'comment-list.export-comments' | translate }}" (click)="openExportDialog()">
       <mat-icon class="searchBarIcon">cloud_download</mat-icon>
     </button>
 
-    <button mat-icon-button class="searchBarButton" *ngIf="!searchBox.value" (click)="openCreateDialog()">
+    <button mat-icon-button class="searchBarButton" *ngIf="!searchBox.value" (click)="openCreateDialog()"
+            matTooltip="{{ 'comment-list.add-comment' | translate }}">
       <mat-icon class="searchBarIcon">add_circle</mat-icon>
     </button>
 
     <button mat-icon-button class="searchBarButton" *ngIf="!searchBox.value && comments.length > 0"
-            [matMenuTriggerFor]="filterMenu">
+            [matMenuTriggerFor]="filterMenu" matTooltip="{{ 'comment-list.filter-comments' | translate }}">
       <mat-icon class="searchBarIcon">sort</mat-icon>
     </button>
   </div>
diff --git a/src/app/components/shared/comment-list/comment-list.component.ts b/src/app/components/shared/comment-list/comment-list.component.ts
index 07252e03cfef15ac7929811d73fc5c3d5eb3d9a3..0a7c7ac6b5b43b69c967eeec58c638995b7b7392 100644
--- a/src/app/components/shared/comment-list/comment-list.component.ts
+++ b/src/app/components/shared/comment-list/comment-list.component.ts
@@ -23,12 +23,13 @@ import { DeleteCommentComponent } from '../_dialogs/delete-comment/delete-commen
 export class CommentListComponent implements OnInit {
   @Input() user: User;
   @Input() roomId: string;
+  @Input() comments: Comment[];
   room: Room;
-  comments: Comment[];
-  isLoading = true;
   hideCommentsList = false;
   filteredComments: Comment[];
   userRole: UserRole;
+  deviceType: string;
+  isLoading = true;
 
   constructor(private commentService: CommentService,
     private translateService: TranslateService,
@@ -49,17 +50,9 @@ export class CommentListComponent implements OnInit {
     this.wsCommentService.getCommentStream(this.roomId).subscribe((message: Message) => {
       this.parseIncomingMessage(message);
     });
-    this.getComments();
     this.translateService.use(localStorage.getItem('currentLang'));
     this.userRole = this.authenticationService.getRole();
-  }
-
-  getComments(): void {
-    this.commentService.getComments(this.roomId)
-      .subscribe(comments => {
-        this.comments = comments;
-        this.isLoading = false;
-      });
+    this.deviceType = localStorage.getItem('deviceType');
   }
 
   searchComments(term: string): void {
@@ -72,6 +65,7 @@ export class CommentListComponent implements OnInit {
   }
 
   showComments(): Comment[] {
+    this.isLoading = false;
     let commentThreshold = -10;
     if (this.room.extensions && this.room.extensions['comments']) {
       commentThreshold = this.room.extensions['comments'].commentThreshold;
diff --git a/src/app/components/shared/comment-page/comment-page.component.html b/src/app/components/shared/comment-page/comment-page.component.html
index 44f9d6b44659f93e633ed89748bd90770abf62ce..5a8df0ad56470a12b90a4850b0a70d310f6b706b 100644
--- a/src/app/components/shared/comment-page/comment-page.component.html
+++ b/src/app/components/shared/comment-page/comment-page.component.html
@@ -1,6 +1,12 @@
+<div *ngIf="isLoading" fxLayout="column" fxLayoutAlign="center" fxFill>
+  <div fxLayout="row" fxLayoutAlign="center">
+    <mat-progress-spinner color="primary" mode="indeterminate"></mat-progress-spinner>
+  </div>
+</div>
+
 <div fxLayout="column" fxLayoutAlign="center" fxLayoutGap="20px">
   <div fxLayout="row" fxLayoutAlign="center">
-    <app-comment-list [user]="user" [roomId]="roomId"></app-comment-list>
+    <app-comment-list [user]="user" [roomId]="roomId" [comments]="comments"></app-comment-list>
   </div>
 </div>
 
diff --git a/src/app/components/shared/comment-page/comment-page.component.ts b/src/app/components/shared/comment-page/comment-page.component.ts
index 725fc8800b5bee1039f167bd72cd7a67c7d2e52f..9c8f4a178733afa36456f248cf2eaa1905edc249 100644
--- a/src/app/components/shared/comment-page/comment-page.component.ts
+++ b/src/app/components/shared/comment-page/comment-page.component.ts
@@ -3,6 +3,8 @@ import { ActivatedRoute } from '@angular/router';
 import { User } from '../../../models/user';
 import { NotificationService } from '../../../services/util/notification.service';
 import { AuthenticationService } from '../../../services/http/authentication.service';
+import { CommentService } from '../../../services/http/comment.service';
+import { Comment } from '../../../models/comment';
 
 @Component({
   selector: 'app-comment-page',
@@ -12,13 +14,25 @@ import { AuthenticationService } from '../../../services/http/authentication.ser
 export class CommentPageComponent implements OnInit {
   roomId: string;
   user: User;
+  isLoading = true;
+  comments: Comment[];
 
   constructor(private route: ActivatedRoute,
               private notification: NotificationService,
-              private authenticationService: AuthenticationService) { }
+              private authenticationService: AuthenticationService,
+              private commentService: CommentService) { }
 
   ngOnInit(): void {
     this.roomId = localStorage.getItem('roomId');
     this.user = this.authenticationService.getUser();
+    this.getComments();
+  }
+
+  getComments(): void {
+    this.commentService.getComments(this.roomId)
+      .subscribe(comments => {
+        this.comments = comments;
+        this.isLoading = false;
+      });
   }
 }
diff --git a/src/app/components/shared/comment/comment.component.html b/src/app/components/shared/comment/comment.component.html
index 78a035810f80b2bc74be269604bdb65e2bb38c5d..98dff1aeefbed675ffe9001795f6853c895876b7 100644
--- a/src/app/components/shared/comment/comment.component.html
+++ b/src/app/components/shared/comment/comment.component.html
@@ -11,19 +11,15 @@
           {{comment.timestamp | date: 'h:mm:ss a, M/d/yy'}}
         </ng-template>
       </div>
-      <button mat-icon-button *ngIf="comment.correct || !isStudent" [disabled]="isStudent" (click)="setCorrect(comment)"
-              [matTooltip]="comment.correct ? 'Unmark as correct' : 'Mark as correct'">
+      <button mat-icon-button *ngIf="comment.correct || !isStudent" [disabled]="isStudent" (click)="setCorrect(comment)">
         <mat-icon [ngClass]="{true : 'correct-icon', false: 'not-marked'}[comment.correct]">check_circle</mat-icon>
       </button>
       <button mat-icon-button *ngIf="comment.favorite || !isStudent" [disabled]="isStudent"
-              (click)="setFavorite(comment)"
-              [matTooltip]="comment.favorite ? 'Mark as not favorite' : 'Mark as favorite'">
+              (click)="setFavorite(comment)">
         <mat-icon [ngClass]="{true: 'favorite-icon', false: 'not-marked'}[comment.favorite]">favorite_border</mat-icon>
       </button>
-      <button mat-icon-button [disabled]="isStudent" (click)="setRead(comment)"
-              [matTooltip]="comment.read ? 'Mark  as unread' : 'Mark as read'">
-        <mat-icon class="icon" [ngClass]="{'read-icon': comment.read,
-                                            'not-marked' : !comment.read}">visibility
+      <button mat-icon-button *ngIf="comment.read || !isStudent" [disabled]="isStudent" (click)="setRead(comment)">
+        <mat-icon class="icon" [ngClass]="{'read-icon': comment.read, 'not-marked' : !comment.read}">visibility
         </mat-icon>
       </button>
     </div>
diff --git a/src/app/components/shared/header/header.component.html b/src/app/components/shared/header/header.component.html
index 07c51d408ea949dcf1a82b51a6514ad63bbfa77a..75e17bba205f3b53ef1aabb229e44b79cbec0f2f 100644
--- a/src/app/components/shared/header/header.component.html
+++ b/src/app/components/shared/header/header.component.html
@@ -1,11 +1,10 @@
 <mat-toolbar class="mat-elevation-z4">
   <mat-toolbar-row>
-    <button *ngIf="router.url !== '/home'" (click)="goBack()" mat-icon-button>
+    <button mat-icon-button *ngIf="router.url !== '/home'" (click)="goBack()"
+            matTooltip="{{'header.back' | translate}}">
       <mat-icon class="header-icons" aria-label="Go back">keyboard_arrow_left</mat-icon>
     </button>
     <span class="fill-remaining-space"></span>
-    <span *ngIf="router.url !== '/home'" class="app-title" (click)="goToHomepage()">ARSnova</span>
-    <span class="fill-remaining-space"></span>
 
     <mat-menu class="color-menu" #themeMenu="matMenu" [overlapTrigger]="false">
       <mat-grid-list cols="2">
@@ -39,7 +38,7 @@
     </mat-menu>
 
     <button mat-icon-button [matMenuTriggerFor]="themeMenu">
-      <mat-icon class="header-icons">palette</mat-icon>
+      <mat-icon class="header-icons" matTooltip="{{'header.change-theme' | translate}}">palette</mat-icon>
     </button>
 
     <mat-menu #langMenu="matMenu" [overlapTrigger]="false">
@@ -48,7 +47,7 @@
     </mat-menu>
 
     <button mat-icon-button [matMenuTriggerFor]="langMenu">
-      <mat-icon class="header-icons">language</mat-icon>
+      <mat-icon class="header-icons" matTooltip="{{'header.change-language' | translate}}">language</mat-icon>
     </button>
 
     <mat-menu #loginMenu="matMenu" [overlapTrigger]="false">
@@ -60,27 +59,29 @@
         <mat-icon class="sessions">turned_in</mat-icon>
         <span>{{'header.visited-sessions' | translate}}</span>
       </button>
-      <button mat-menu-item  (click)="logout()">
+      <button mat-menu-item (click)="logout()">
         <mat-icon color="warn">exit_to_app</mat-icon>
         <span>{{ 'header.logout' | translate }}</span>
       </button>
     </mat-menu>
 
     <mat-menu #userMenu="matMenu" [overlapTrigger]="false">
-        <button mat-menu-item (click)=login(true)>
-          <mat-icon>record_voice_over</mat-icon>
-          <span>{{ 'login-page.creator' | translate }}</span>
-        </button>
-        <button mat-menu-item (click)=login(false)>
-          <mat-icon>supervisor_account</mat-icon>
-          <span>{{ 'login-page.participant' | translate }}</span>
-        </button>
+      <button mat-menu-item (click)=login(true)>
+        <mat-icon>record_voice_over</mat-icon>
+        <span>{{ 'login-page.creator' | translate }}</span>
+      </button>
+      <button mat-menu-item (click)=login(false)>
+        <mat-icon>supervisor_account</mat-icon>
+        <span>{{ 'login-page.participant' | translate }}</span>
+      </button>
     </mat-menu>
 
-    <button mat-icon-button *ngIf="!user" [matMenuTriggerFor]="userMenu">
+    <button mat-icon-button *ngIf="!user" [matMenuTriggerFor]="userMenu"
+            matTooltip="{{'header.login' | translate}}">
       <mat-icon class="header-icons">account_box</mat-icon>
     </button>
-    <button mat-icon-button *ngIf="user" [matMenuTriggerFor]="loginMenu">
+    <button mat-icon-button *ngIf="user" [matMenuTriggerFor]="loginMenu"
+            matTooltip="{{'header.my-account' | translate}}">
       <mat-icon class="header-icons">account_box</mat-icon>
     </button>
   </mat-toolbar-row>
diff --git a/src/app/components/shared/list-statistic/list-statistic.component.html b/src/app/components/shared/list-statistic/list-statistic.component.html
index f15b78a3b1e11bb9fc536d2ef1cb82f20e1fa99e..42fba1bdf70d1d3a91548e7d06628a276d7dd02d 100644
--- a/src/app/components/shared/list-statistic/list-statistic.component.html
+++ b/src/app/components/shared/list-statistic/list-statistic.component.html
@@ -6,44 +6,52 @@
 <mat-progress-bar class="progress-theme" mode="determinate" value="{{total}}"
                   *ngIf="total < status.okay && total != status.empty" color="warn"></mat-progress-bar>
 <mat-toolbar></mat-toolbar>
+
 <table mat-table [dataSource]="dataSource" class="mat-elevation-z8">
 
   <ng-container matColumnDef="content">
     <mat-header-cell *matHeaderCellDef> {{'statistic.content' | translate}} </mat-header-cell>
     <mat-cell *matCellDef="let cp" [ngClass]="{
+      'empty' : cp.percent < status.zero,
       'positive' : cp.percent >= status.good,
       'okay' : cp.percent >= status.okay && cp.percent < status.good,
-      'negative' : cp.percent < status.okay,
-      'empty' : cp.percent < status.zero }" (click)="goToStats(cp.contentId)">{{cp.content.subject}}</mat-cell>
+      'negative' : cp.percent < status.okay}" (click)="goToStats(cp.contentId)">{{cp.content.subject}}</mat-cell>
   </ng-container>
 
   <ng-container matColumnDef="percentage">
     <mat-header-cell *matHeaderCellDef> {{'statistic.percentage' | translate }} </mat-header-cell>
     <mat-cell *matCellDef="let cp" [ngClass]="{
+      'empty invisible' : cp.percent < status.zero ,
       'positive' : cp.percent >= status.good,
       'okay' : cp.percent >= status.okay && cp.percent < status.good,
-      'negative' : cp.percent < status.okay,
-      'empty invisible' : cp.percent < status.zero }" (click)="goToStats(cp.contentId)">{{cp.percent.toFixed() + ' %'}}</mat-cell>
+      'negative' : cp.percent < status.okay}"
+              (click)="goToStats(cp.contentId)">{{cp.percent.toFixed() + ' %'}}</mat-cell>
   </ng-container>
 
   <ng-container matColumnDef="abstentions">
     <mat-header-cell *matHeaderCellDef> {{'statistic.abstentions' | translate}} </mat-header-cell>
     <mat-cell *matCellDef="let cp" [ngClass]="{
+      'empty invisible' : cp.percent < status.zero,
       'positive' : cp.percent >= status.good,
       'okay' : cp.percent >= status.okay && cp.percent < status.good,
-      'negative' : cp.percent < status.okay,
-      'empty invisible' : cp.percent < status.zero }" (click)="goToStats(cp.contentId)">{{cp.abstentions}}</mat-cell>
+      'negative' : cp.percent < status.okay}" (click)="goToStats(cp.contentId)">{{cp.abstentions}}</mat-cell>
   </ng-container>
 
   <ng-container matColumnDef="counts">
     <mat-header-cell *matHeaderCellDef> {{'statistic.answers' | translate}} </mat-header-cell>
     <mat-cell *matCellDef="let cp" [ngClass]="{
+    'empty invisible' : cp.percent < status.zero,
       'positive' : cp.percent >= status.good,
       'okay' : cp.percent >= status.okay && cp.percent < status.good,
-      'negative' : cp.percent < status.okay,
-      'empty invisible' : cp.percent < status.zero }" (click)="goToStats(cp.contentId)">{{cp.counts}}</mat-cell>
+      'negative' : cp.percent < status.okay}" (click)="goToStats(cp.contentId)">{{cp.counts}}</mat-cell>
   </ng-container>
 
   <mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
   <mat-row *matRowDef="let row; columns: displayedColumns"></mat-row>
 </table>
+
+<div *ngIf="isLoading" fxLayout="column" fxLayoutAlign="center" fxLayoutGap="20px" fxFill>
+  <div fxLayout="row" fxLayoutAlign="center">
+    <mat-progress-spinner mode="indeterminate" diameter="50"></mat-progress-spinner>
+  </div>
+</div>
diff --git a/src/app/components/shared/list-statistic/list-statistic.component.scss b/src/app/components/shared/list-statistic/list-statistic.component.scss
index 00adbe55fb791540cd3ecc77c8db0ea22aff6f48..bbf3359fd19cb77dcf7ddbd3dc274f1e6316ea0c 100644
--- a/src/app/components/shared/list-statistic/list-statistic.component.scss
+++ b/src/app/components/shared/list-statistic/list-statistic.component.scss
@@ -62,3 +62,7 @@ mat-toolbar {
 #okayP {
   color: var(--yellow);
 }
+
+mat-progress-spinner {
+  margin-top: 30px;
+}
diff --git a/src/app/components/shared/list-statistic/list-statistic.component.ts b/src/app/components/shared/list-statistic/list-statistic.component.ts
index 3480e3ece17c69ebae2b386b12930cd9ae84d050..a9554b6dfb7b591c3d99f711b2ccddc4eee4f189 100644
--- a/src/app/components/shared/list-statistic/list-statistic.component.ts
+++ b/src/app/components/shared/list-statistic/list-statistic.component.ts
@@ -51,6 +51,7 @@ export class ListStatisticComponent implements OnInit {
   roomId: number;
   baseUrl: string;
   deviceType = localStorage.getItem('deviceType');
+  isLoading = true;
 
   constructor(private contentService: ContentService,
               private translateService: TranslateService,
@@ -120,6 +121,7 @@ export class ListStatisticComponent implements OnInit {
         this.dataSource[i].percent = -1;
       }
     }
+    this.isLoading = false;
   }
 
   getSingleCounts(answers: number[]): number {
diff --git a/src/app/components/shared/room-list/room-list.component.html b/src/app/components/shared/room-list/room-list.component.html
index cc6dbe0a5acd5927d3cd19c0f98505c9d0311d85..0ab9341c8a5e5a21c939a9b08d6b0ecd87c695e0 100644
--- a/src/app/components/shared/room-list/room-list.component.html
+++ b/src/app/components/shared/room-list/room-list.component.html
@@ -1,3 +1,9 @@
+<div *ngIf="isLoading" fxLayout="column" fxLayoutAlign="center" fxFill>
+  <div fxLayout="row" fxLayoutAlign="center">
+    <mat-progress-spinner color="primary" mode="indeterminate" diameter="80"></mat-progress-spinner>
+  </div>
+</div>
+
 <div *ngIf="rooms && rooms.length != 0">
   <mat-expansion-panel [disabled]="true" id="matPanelHeader">
     <mat-expansion-panel-header>
diff --git a/src/app/components/shared/room-list/room-list.component.scss b/src/app/components/shared/room-list/room-list.component.scss
index 36f04a865381cfdfc82fa1ad12f31e8e4a29b86f..5e8f796a3a351f9b10a0210b30f9c1229276300f 100644
--- a/src/app/components/shared/room-list/room-list.component.scss
+++ b/src/app/components/shared/room-list/room-list.component.scss
@@ -50,3 +50,7 @@ mat-card-title {
   background-color: var(--grey);
   color: var(--primary);
 }
+
+mat-progress-spinner {
+  margin-top: 30px;
+}
diff --git a/src/assets/i18n/creator/de.json b/src/assets/i18n/creator/de.json
index ff04dd4b82978107fdae01b211f8ed3093322bec..eb32ec070a1d6a4226c9806404c341228f2ee0a0 100644
--- a/src/assets/i18n/creator/de.json
+++ b/src/assets/i18n/creator/de.json
@@ -94,8 +94,10 @@
     "really": "Wollen sie wirklich alle Kommentare dieser Session löschen?",
     "no-comments": "Es wurden noch keine Kommentare erstellt ..."
   },
-  "comment-list-page": {
+  "comment-list": {
     "search": "Suchen",
-    "cancel": "Abbrechen"
+    "export-comments": "Kommentare exportieren",
+    "filter-comments": "Kommentare Sortieren",
+    "add-comment": "Kommentar erstellen"
   }
 }
diff --git a/src/assets/i18n/creator/en.json b/src/assets/i18n/creator/en.json
index 50e6bcb68a12a99817f02328b99dc06f17de919c..c6fb0b52cf7853c3d6b1d10ccc48b437a475ef36 100644
--- a/src/assets/i18n/creator/en.json
+++ b/src/assets/i18n/creator/en.json
@@ -94,8 +94,10 @@
     "really": "Do you really want to delete all comments of this session?",
     "no-comments": "No comments have been created yet ..."
   },
-  "comment-list-page": {
+  "comment-list": {
     "search": "Search",
-    "cancel": "Cancel"
+    "export-comments": "Export comments",
+    "filter-comments": "Sort comments",
+    "add-comment": "Create comment"
   }
 }
diff --git a/src/assets/i18n/home/de.json b/src/assets/i18n/home/de.json
index 7d5899df57300df974694a12dca978fb400e81d2..ca8ed1c1175f0a4fb8ce69463b08608e810f7824 100644
--- a/src/assets/i18n/home/de.json
+++ b/src/assets/i18n/home/de.json
@@ -8,8 +8,10 @@
 		"back": "Zurück",
 		"my-sessions": "Meine Sessions",
 		"visited-sessions": "Besuchte Sessions",
-    "default": "ARSnova",
-    "dark": "Nacht"
+    "change-theme": "Theme ändern",
+    "change-language": "Sprache ändern",
+    "login": "Login",
+    "my-account": "Mein Account"
 	},
 	"login-page": {
 		"creator": "Dozent/in",
diff --git a/src/assets/i18n/home/en.json b/src/assets/i18n/home/en.json
index 3691c26bfc340bc8f875c63ab7fa3c2e73721a65..d8cdb9223e5c9a447e83ec0a803084a5b4c299b1 100644
--- a/src/assets/i18n/home/en.json
+++ b/src/assets/i18n/home/en.json
@@ -8,8 +8,10 @@
 		"back": "Back",
 		"my-sessions": "My Sessions",
 		"visited-sessions": "Visited Sessions",
-    "default": "ARSnova",
-    "dark": "Night"
+    "change-theme": "Change theme",
+    "change-language": "Change language",
+    "login": "Login",
+    "my-account": "My account"
 	},
 	"login-page": {
 		"creator": "Lecturer",
diff --git a/src/assets/i18n/participant/de.json b/src/assets/i18n/participant/de.json
index 0c25a7baadb452a93190cd92f96168f2139fb031..83c4bcc6e3ee7d165408c3e6fd90bcb806d86b89 100644
--- a/src/assets/i18n/participant/de.json
+++ b/src/assets/i18n/participant/de.json
@@ -24,9 +24,10 @@
     "error-both-fields": "Bitte füllen Sie alle Felder aus.",
     "no-comments": "Es wurden noch keine Kommentare erstellt ..."
   },
-  "comment-list-page": {
+  "comment-list": {
     "search": "Suchen",
-    "cancel": "Abbrechen"
+    "filter-comments": "Kommentare Sortieren",
+    "add-comment": "Kommentar erstellen"
   },
   "answer": {
     "submit": "Absenden",
diff --git a/src/assets/i18n/participant/en.json b/src/assets/i18n/participant/en.json
index b98e799cb3b2decd47402464b429c8ca477d5b06..64552a26aed6509cce9d23097b3902c8a4067de9 100644
--- a/src/assets/i18n/participant/en.json
+++ b/src/assets/i18n/participant/en.json
@@ -24,9 +24,10 @@
     "error-both-fields": "Please fill in all fields.",
     "no-comments": "No comments have been created yet ..."
   },
-  "comment-list-page": {
+  "comment-list": {
     "search": "Search",
-    "cancel": "Cancel"
+    "filter-comments": "Sort comments",
+    "add-comment": "Create comment"
   },
   "answer": {
     "submit": "Submit",
diff --git a/src/assets/icons/favicon.png b/src/assets/icons/favicon.png
new file mode 100644
index 0000000000000000000000000000000000000000..a4a8924b72205820d7dff943cd1b838c635cc7c1
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diff --git a/src/assets/icons/icon-128x128.png b/src/assets/icons/icon-128x128.png
deleted file mode 100644
index 9f9241f0be40661db1eed29384231e76d33b6e7c..0000000000000000000000000000000000000000
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diff --git a/src/assets/icons/icon-144x144.png b/src/assets/icons/icon-144x144.png
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diff --git a/src/assets/icons/icon-152x152.png b/src/assets/icons/icon-152x152.png
deleted file mode 100644
index 34a1a8d645872c776c9425de45c3fcfba12c271e..0000000000000000000000000000000000000000
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diff --git a/src/assets/icons/icon-192x192.png b/src/assets/icons/icon-192x192.png
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diff --git a/src/assets/icons/icon-384x384.png b/src/assets/icons/icon-384x384.png
deleted file mode 100644
index e54e8d3eafe56a617b9de13c361ed68657371e84..0000000000000000000000000000000000000000
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diff --git a/src/assets/icons/icon-512x512.png b/src/assets/icons/icon-512x512.png
index 51ee297df1cbeb0354814ffe95afa6e4bc86ea23..07ce678d530aa3130b736a85efa3bad20f37939a 100644
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diff --git a/src/assets/icons/icon-72x72.png b/src/assets/icons/icon-72x72.png
deleted file mode 100644
index 2814a3f30caf3abf4de2ac85082ef83888b4b479..0000000000000000000000000000000000000000
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diff --git a/src/assets/icons/icon-96x96.png b/src/assets/icons/icon-96x96.png
deleted file mode 100644
index d271025c4f22c7ba3c5f43ccfcab0e52ebbe80ca..0000000000000000000000000000000000000000
Binary files a/src/assets/icons/icon-96x96.png and /dev/null differ
diff --git a/src/index.html b/src/index.html
index e33f54078b0dc55598895e0d3395b616df110297..ae854574211cb24bd7e4335c3b1a9cbeee07de09 100644
--- a/src/index.html
+++ b/src/index.html
@@ -4,31 +4,31 @@
   <meta charset="utf-8">
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="description" content="A responsive, interactive Audience Response System, developed at THM">
-  <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=2.0">
   <title>ARSnova</title>
 
   <base href="/">
 
   <!-- Add to homescreen for Chrome on Android -->
   <meta name="mobile-web-app-capable" content="yes">
-  <link rel="icon" sizes="192x192" href="assets/images/android-desktop.png">
+  <link rel="icon" sizes="192x192" href="assets/icons/icon-192x192.png">
 
   <!-- Add to homescreen for Safari on iOS -->
   <meta name="apple-mobile-web-app-capable" content="yes">
-  <meta name="apple-mobile-web-app-status-bar-style" content="#4DB6AC">
+  <meta name="apple-mobile-web-app-status-bar-style" content="#fafafa">
   <meta name="apple-mobile-web-app-title" content="ARSnova">
-  <link rel="apple-touch-icon-precomposed" href="assets/images/ios-desktop.png">
+  <link rel="apple-touch-icon-precomposed" href="assets/icons/icon-144x144.png">
 
   <!-- Tile icon for Win8 (144x144 + tile color) -->
-  <meta name="msapplication-TileImage" content="assets/images/touch/ms-touch-icon-144x144-precomposed.png">
-  <meta name="msapplication-TileColor" content="#3372DF">
+  <meta name="msapplication-TileImage" content="assets/icons/icon-192x192">
+  <meta name="msapplication-TileColor" content="#fafafa">
 
-  <link rel="shortcut icon" href="assets/images/favicon.png">
+  <link rel="shortcut icon" href="assets/icons/favicon.png">
 
   <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:regular,bold,italic,thin,light,bolditalic,black,medium&amp;lang=en">
   <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
   <link rel="manifest" href="manifest.webmanifest">
-  <meta name="theme-color" content="#b2dfdb">
+  <meta name="theme-color" content="#fafafa">
 </head>
 <body>
   <app-root></app-root>
diff --git a/src/manifest.webmanifest b/src/manifest.webmanifest
index 346ea67f7dd63d65386bcaa888bdc7912ac2c04e..f13e92090d423a9f0912179b5fd74eeae98aa764 100644
--- a/src/manifest.webmanifest
+++ b/src/manifest.webmanifest
@@ -1,8 +1,8 @@
 {
   "name": "ARSnova Lite",
   "short_name": "ARSnova",
-  "theme_color": "#b2dfdb",
-  "background_color": "#b2dfdb",
+  "theme_color": "#fafafa",
+  "background_color": "#fafafa",
   "display": "standalone",
   "scope": "/",
   "start_url": "/home",