French (fr): Revert remainder of NBSP characters

[johnnyshields]

In 6f21c25, @benoittgt partially reverted "thin spaces" i.e. NBSP characters from French (fr) locale.

I do not understand the reason for a "partial" revert. It's not explained in the commit, and there seems to be no consistent logic regarding which NBSP chars were reverted. For example:

      too_long:
        other: est trop long (pas plus de %{count} caractères) # not reverted 🤷 
      too_short:
        other: est trop court (au moins %{count} caractères)   # reverted

This PR reverts all NBSP chars from fr, and in the future if the maintainers would like to make some consistent rule on where/how NBSP should in which locales, let's re-apply it at that time.

[pama]

That was reverted due to #889 (comment) I believe.

In my opinion, rails-i18n should not address nbsp, at all (for some reasons here #881 and here #889)

[pama]

@DevDef @arkadiybutermanov @jbbarth @benoittgt