update_weblate_git: langs.json &isWikiPo
_Originally created by @hefee on [#16487 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/16487)_
I made some small mistakes to fix tails/sysadmin#16449, and the merge stategy does
not work. Those two fixes should now make it working in the end.
It now loads correctly langs.json from
`/var/lib/weblate/scripts/config/langs.json` and
fixes:
FileNotFoundError: [Errno 2] No such file or directory: '/var/lib/weblate/scripts/langs.json'
also fixing the issue, that isWikiPo does not detect po files in
src/wiki.
Feature Branch: https://salsa.debian.org/hefee/puppet-tails/tree/hefee/dev/translation-server
Parent Task: tails/tails#10034
issue