(NOTE: There may still be problems with
https://phabricator.wikimedia.org/T320220This bug might be connected to 3 issues:
* where the "Translate this page" link takes you to the wrong content,
* or shows the error message "Invalid value for parameter mcgroup",
* or fails to load the translation aids.
If you encounter this, the problem seems to clear up after ~30 minutes, so just try again later.)