Fixes wrong i18n key for somebody.

lang/main.json

         "focus": "Conference focus",
         "focusFail": "__component__ not available - retry in __ms__ sec",
         "grantedTo": "Moderator rights granted to __to__!",
-        "grantedToUnknown": "Moderator rights granted to $t(somebody)!",
+        "grantedToUnknown": "Moderator rights granted to $t(notify.somebody)!",
         "muted": "You have started the conversation muted.",
         "mutedTitle": "You're muted!",
         "raisedHand": "Would like to speak."

modules/UI/UI.js

     } else {
         messageHandler.notify(
             '', 'notify.somebody',
-            'connected', 'notify.grantedToUnknown', {}
-        );
+            'connected', 'notify.grantedToUnknown');
     }
 };