[3.2] Rely on Intl and mbstring, use patchwork/utf8 as fallback
* nicolas-grekas/develop:
[feature/patchwork-utf8] Rely on mbstring, use patchwork/utf8 as fallback
[feature/patchwork-utf8] Remove utf8_str_replace
[feature/patchwork-utf8] Normalize with intl, use patchwork/utf8 as fallback