Added notice info about the Invidious update. TODO: remove this in the future.

_locales/en/messages.json

@@ -380,5 +380,11 @@
     },
     "whatAutoUpvote": {
         "message": "With this enabled, the extension will upvote all submissions you view if you do not report them. If the notice is disabled, this will not occur."
+    },
+    "invidiousInfo1": {
+        "message": "Invidious (the 3rd party YouTube site) support has been added!"
+    },
+    "invidiousInfo2": {
+        "message": "You MUST enable it in the options for it to work."
     }
 }