Add i18n and do some style things

src/app/components/home/login-page/login-page.component.html

@@ -4,7 +4,7 @@
       <mat-card-header fxlayoutalign="center">
         <mat-card-title fxlayoutalign="center">
           <h1 class="main-heading">
-            <span class="main-heading-secondary">Welcome to</span>
+            <span class="main-heading-secondary">{{ 'login-page.welcome' | translate }}</span>
             <span class="main-heading-primary">ARSnova</span>
           </h1>
       </mat-card-title>
@@ -29,7 +29,7 @@
                 </div>
              </mat-tab>
              </mat-tab-group>
-             <div fxLayout="row" fxLayoutAlign="center" fxLayoutGap="5px">
+             <div fxLayout="row" fxLayoutAlign="center" fxLayoutGap="18px">
                 <button mat-raised-button class="regButton" color="primary" (click)="openRegisterDialog()">
                   {{ 'login-page.register' | translate }}
                 </button>

src/app/components/home/login-page/login-page.component.scss

 @import '../../../../styles';
 
 .mat-raised-button {
-  margin-top: 5%;
+  margin-top: 2%;
 }
 
 .inner {

src/assets/i18n/home/de.json

@@ -10,7 +10,8 @@
 		"creator": "Dozent/in",
 		"participant": "Student/in",
 		"password-reset": "Passwort zurücksetzen",
-		"register": "Registrieren"
+		"register": "Registrieren",
+    "welcome": "Wilkommen bei"
 	},
 	"login": {
 		"email": "E-Mail",

src/assets/i18n/home/en.json

@@ -10,7 +10,8 @@
 		"creator": "Creator",
 		"participant": "Participant",
 		"password-reset": "Reset password",
-		"register": "Register"
+		"register": "Register",
+    "welcome": "welcome to"
 	},
 	"login": {
 		"email": "E-Mail",