110615: Added missing vocabulary search input label

Author: alexandrevryghem

src/app/shared/form/vocabulary-treeview/vocabulary-treeview.component.html

@@ -2,7 +2,9 @@
 <div class="treeview-header row">
   <div class="col-12">
     <div class="input-group">
-      <input type="text" class="form-control" [(ngModel)]="searchText" (keyup.enter)="search()">
+      <input type="text" class="form-control" [(ngModel)]="searchText"
+             [attr.aria-label]="'vocabulary-treeview.search.form.search-placeholder' | translate"
+             (keyup.enter)="search()">
       <div class="input-group-append" id="button-addon4">
         <button class="btn btn-outline-primary" type="button" (click)="search()" [disabled]="!isSearchEnabled()">
           {{'vocabulary-treeview.search.form.search' | translate}}

src/assets/i18n/en.json5

@@ -4736,6 +4736,8 @@
 
   "vocabulary-treeview.search.form.search": "Search",
 
+  "vocabulary-treeview.search.form.search-placeholder": "Filter results by typing the first few letters",
+
   "vocabulary-treeview.search.no-result": "There were no items to show",
 
   "vocabulary-treeview.tree.description.nsi": "The Norwegian Science Index",