support linking OAuth 2.0 user to logged-in users

src/locales/uk.json

@@ -1257,6 +1257,7 @@
         "cannot retrieve oauth2 token": "Cannot retrieve OAuth 2.0 token",
         "invalid oauth2 token": "Invalid OAuth 2.0 token",
         "cannot retrieve user info from oauth2 provider": "Cannot retrieve user info from OAuth 2.0 provider",
+        "oauth2 user already bound to another user": "OAuth 2.0 user is already bound to another user",
         "query items cannot be blank": "Елементи запиту не можуть бути порожніми",
         "query items too much": "Занадто багато елементів запиту",
         "query items have invalid item": "Запит містить недійсний елемент",
@@ -2154,6 +2155,7 @@
     "Unable to clear user data": "Не вдалося очистити дані",
     "Third-Party Logins": "Third-Party Logins",
     "Linked Time": "Linked Time",
+    "Link": "Link",
     "Unlink": "Unlink",
     "Are you sure you want to unlink this login method?": "Are you sure you want to unlink this login method?",
     "Unable to retrieve third-party logins list": "Unable to retrieve third-party logins list",