GitLab is used only for code review, issue tracking and project management. Canonical locations for source code are still https://gitweb.torproject.org/ https://git.torproject.org/ and git-rw.torproject.org.
In Tor Browser, we're delivering localized URLs to Community portal, but we don't have localization ready, so users are getting 404 - e.g. https://community.torproject.org/de .
Using htaccess rules, we should temporarily rewrite localized URLs to https://community.torproject.org/