- remove ubuntu 21.04 from CI (end of life)
- adjust matrix strategy for clang.yml
- Use lessons learned from RetroArcher on localize.yml, crowdin.yml, and locale.py
- Add end of life comments to Dockerfiles
- Adjust dependency order in Dockerfiles
- Rename extracted template file to `sunshine.po`
- Add `crowdin.yml`
- Remove `--init` and `--update` from `localize.yml`
- Crowdin will initialize new languages and update existing ones
