I ran rebuildLocalisationCache.php on translatewiki.net. All languages worked well, except the following error:
Rebuilding szl...
A database error has occurred. Did you forget to run maintenance/update.php after upgrading? See: https://www.mediawiki.org/wiki/Manual:Upgrading#Run_the_update_script
Query: DELETE FROM bw_msg_resource
Function: MessageBlobStore::clear
Error: 1213 Deadlock found when trying to get lock; try restarting transaction (localhost)
Version: unspecified
Severity: normal