Change 'blog' to 'help' and adjsut icon in footer

src/app/components/shared/footer/footer.component.html

 <footer>
   <mat-toolbar id="footer-toolbar">
     <button mat-button (click)="navToBlog()" *ngIf="router.url !== '/home'">
-      <mat-icon>ondemand_video</mat-icon>
+      <mat-icon>help_outline</mat-icon>
       <span *ngIf="deviceType === 'desktop'">
-        {{ 'footer.blog' | translate }}
+        {{ 'footer.help' | translate }}
       </span>
     </button>
     <button mat-button (click)="showDemo()" *ngIf="router.url === '/home'">

src/assets/i18n/home/de.json

@@ -94,7 +94,7 @@
     "imprint": "Impressum",
     "will-open": " wird in einem neuen Fenster geöffnet...",
     "open": "Öffnen",
-    "blog": "Blog",
+    "help": "Hilfe",
     "dark": "Dunkler Hintergrund",
     "bright": "Heller Hintergrund",
     "beamer": "Für den Beamer optimiert (in Arbeit)",

src/assets/i18n/home/en.json

@@ -94,7 +94,7 @@
     "imprint": "Imprint",
     "will-open": " will be opened in a new tab...",
     "open": "Open",
-    "blog": "Blog",
+    "help": "Help",
     "dark": "Dark background",
     "bright": "Bright background",
     "beamer": "Optimized for the projector (work in progress)",