Fix accessibility issue: link has no discernible text

src/app/shared/rss-feed/rss.component.html

@@ -1,5 +1,5 @@
 <ng-container *ngIf="(isEnabled$ | async) && (hasRoute('home') || hasRoute('collections') || hasRoute('communities'))">
   <div *ngIf="route$ | async as route" class="d-inline-block float-right margin-right">
-    <a [href]="route" class="btn btn-secondary"><i class="fas fa-rss-square"></i></a>
+    <a [href]="route" class="btn btn-secondary" [title]="'feed.description' | translate" [attr.aria-label]="'feed.description' | translate"><i class="fas fa-rss-square"></i></a>
   </div>
 </ng-container>

src/assets/i18n/en.json5

@@ -1401,6 +1401,9 @@
   "error.validation.groupExists": "This group already exists",
 
 
+  "feed.description": "Syndication feed",
+
+
   "file-section.error.header": "Error obtaining files for this item",