i18n for some components.

frontend/src/app/components/confirmation-dialog/confirmation-dialog.component.html

@@ -1,10 +1,10 @@
 <h1>{{title}}</h1>
 <h2>{{description}}</h2>
 <footer>
-    <button type="button" class="secondary" (click)="closeDialog()">
+    <button type="button" class="secondary" (click)="closeDialog()" i18n>
         No
     </button>
-    <button type="button" (click)="closeAndValidate()">
+    <button type="button" (click)="closeAndValidate()" i18n>
         Yes
     </button>
 </footer>