forked from gitea/gitea

Backport #22019 Although there are per-locale fallbacks for ambiguity the locale names for Chinese do not quite match our locales. This PR simply maps zh-CN on to zh-hans and other zh variants on to zh-hant. Ref #20999 Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: Lauris BH <lauris@nix.lv>