Mark 'These settings apply only to' string as i18n-able

client/src/app/modal/quick-settings-modal.component.html

@@ -5,7 +5,7 @@
   </div>
 
   <div class="modal-body">
-    <div class="mb-4 font-italic">These settings apply only to your session on this instance.</div>
+    <div i18n class="mb-4 font-italic">These settings apply only to your session on this instance.</div>
 
     <div i18n class="mb-4 quick-settings-title">Display settings</div>