Fix chinese translation

Issues
- "意钱" is possibly a typo. Should be "以前"
- I have never heard of "恩 等 1 秒" and I don't think it is grammatically correct.
- "cn" is not ISO639-1 language code. The correct one should be zh.

Also added traditional chinese translation.
I was seeing "diff.ago.day" and spent minutes debugging because of this… let makes this explicit.
Merge branch 'translation'
Fix chinese translation