Avoid showing "undefined" when clicking on read/unread

template/templates/views/entry.html

@@ -13,6 +13,7 @@
                     <a href="#"
                         title="{{ t "entry.status.title" }}"
                         data-toggle-status="true"
+                        data-label-loading="{{ t "entry.state.saving" }}"
                         data-label-unread="{{ t "entry.status.unread" }}"
                         data-label-read="{{ t "entry.status.read" }}"
                         data-toast-unread="{{ t "entry.status.toast.unread" }}"