All translation is missing from the latest Krita nightly appimage builds. There is only American English in the Switch Language dialogue. Windows version is not affected. Since krita-5.1.0-prealpha-c725d3bd1c-x86_64.appimage (2022-06-19)
It seems to have only affected Krita plus appimage (Krita 5.1), the Krita Next appimages (Krita 5.2) are not affected.
Probably just a temporary svn server outage. [2022-06-18T18:37:16.690Z] svn: E170013: Unable to connect to a repository at URL 'svn://anonsvn.kde.org/home/kde/branches/stable/l10n-kf5/subdirs' [2022-06-18T18:37:16.690Z] svn: E210002: Network connection closed unexpectedly
Oh, so that's probably the same reason the KDE Simplified Chinese translation has been broken for a few days. Maybe related to the DDoS attack a while ago? We have repaired the broken translation, let's see whether it can be fixed by tonight's build, then I will close the bug.
Yep, it's fixed today.