Add missing invite link i18 key

Author: krokosik

public/locales/en/common.json

@@ -292,6 +292,7 @@
         "title": "Add members",
         "warning": "Warning: Don't use send invite if it's invalid email. use add to Split Pro instead. Your account will be blocked if this feature is misused"
       },
+      "invite_link": "Invite link",
       "no_members": "No members in the group yet."
     },
     "tabs": {