Interface translation files get saved into the translations directory. But the files are only removed when a module is disabled or a language gets removed. But during the life time of a module (usually the life time of a site) translation files remain into the translations directory. The translation file name contains the module version number, translations files are unique per (stable) release. Therefore with each update a new file, with a different file name, will be stored and old files fill-up the directory (e.g. token-8.x-1.0-beta1.nl.po, token-8.x-1.0-beta3.nl.po, token-8.x-1.0.nl.po).
There is another case of file cluttering that originates from a bug to be fixed in #2949825: Downloaded translation file should replace existing → . New translation files with the same name as existing files will get renamed (e.g. token-8.x-1.0.nl_0.po instead of token-8.x-1.0.nl.po). This clean-up issue can cover those files too.
Options:
Files from three different souces should be distinguished: Contributed modules (fix file name pattern), Custom modules (variable file name pattern), Manually uploaded translations (language known, may not be related to a module).
Postponed 🐛 A new module version is not recognized by interface translation update. Fixed
Perhaps additional documentation about custom 'interface translation server pattern'
not expected
not expected
Postponed
10.1 ✨
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.
This was a bugsmash triage target today. Both Lendude and I think this should be postponed on the issue mentioned in #9. Lendude pointed out that the other issue 'needs only a few deprecations'. Also changing to a task as this is cleanup, not a bug.
If you find yourself here, maybe you could help out in the other issue. Thx,