Moving language files around breaks the update of translation on live site with LocalisationUpdate. If possible, add a symlink until this get deployed on WMF wikis.
Duplicatebug > is that still bugged?
Marking fixme as a reminder to look this one more carefully.
In my opinion, yes. It is possible to look into the logs of the run on WMF wikis?
The logs can contains some errors like:
Cannot get the contents of \FlaggedRevs\presentation\language\FlaggedRevs.i18n.php
You can create a frontend -> presentation symlink in the 1.18 version of MW on /home.
I have added the link. The issue is that now 'fronted' is non versioned :-/
Symlink added in wmf branch by Reedy with r104088