Yeah it seems to be hitting a limit. I am able to translate up to 10 languages without it failing and my files are around 8k lines. Any more and the build instantly fails.
It fails even if there are only 2 entries in the po file
[2024.11.30-07.57.27:008][ 7]LogOnline: Warning: OSS: Http Unexpected Result: HttpResult: 0 Code: 0 Error: Failure ErrorCode=errors.com.epicgames.online.generic.connection_failure, Message=Connection to the server failed., Raw=connection_failure
[2024.11.30-07.57.27:008][ 7]LogValkyrieAutoLocalization: Error: [Failure] Auto Localization - Connection to the server failed.
I found a “solution” to the localization problem. It turns out that when doing export localization, the autolocalization files generated by epic generate the code for the new translations but do not translate anything until doing build auto localization (which fails), but if I manually put the translations in the files, the auto localization build completes successfully immediately and the localization works!