[feature/patchwork-utf8] Normalize with intl, use patchwork/utf8 as fallback
[feature/patchwork-utf8] Remove utf8_str_replace
[feature/patchwork-utf8] Rely on mbstring, use patchwork/utf8 as fallback
Merge pull request #1880 from nicolas-grekas/develop

[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