Update list of l10n packages for tier-1 supported languages
For example, when we did #15807 (closed), these packages simply did not exist so we could not install them:
- spellchecking dictionary for zh-CN
- thunderbird-l10n-{fa,hi}
… maybe they’ve now appeared in the Debian archive?
Related issues
- Related to #15807 (closed)
- Blocks #16209
Original created by @intrigeri on 16648 (Redmine)