feat(messenger): show 'sent while offline' marker in thread

public/configuration/UITexts.example

@@ -265,5 +265,6 @@
     "loading.task.userdata": "loading user data...",
     "loading.task.rooms": "loading rooms...",
     "loading.task.engine": "loading graphics engine...",
-	"catalog.gift_wrapping.gift_sent": "Done!"
+	"catalog.gift_wrapping.gift_sent": "Done!",
+    "messenger.offline.delivered": "Sent while you were offline"
 }

src/components/friends/views/messenger/messenger-thread/FriendsMessengerThreadGroup.tsx

@@ -65,7 +65,13 @@ export const FriendsMessengerThreadGroup: FC<{ thread: MessengerThread, group: M
                     {
                         if(!chat.showTranslation)
                         {
-                            return <Base key={ index } className="text-break">{ chat.message }</Base>;
+                            return (
+                                <Base key={ index } className="text-break">
+                                    { chat.message }
+                                    { chat.offlineDelivered &&
+                                        <span className="messenger-offline-tag">{ LocalizeText('messenger.offline.delivered') }</span> }
+                                </Base>
+                            );
                         }
 
                         return (

src/css/friends/FriendsView.css

@@ -894,3 +894,11 @@
     max-height: 220px;
     overflow-y: auto;
 }
+
+.messenger-offline-tag {
+    display: block;
+    margin-top: 2px;
+    font-size: 10px;
+    font-style: italic;
+    opacity: 0.6;
+}