Antoine That's so fantastic! I'll just wait for your next version. Thanks.
zh-rCN.yml was encoded in UTF-8, and named follow Andriod Naming Rule. Just like Arabic, Egypt (ar_rEG)、English, Australia (en_rAU)、English, US (en_rUS)、Chinese, PRC (zh_rCN)、Chinese, Taiwan (zh_rTW) etc.
I don't know how to name for Flarum indeed ?
I also made the language file of Traditional Chinese. See below: