Blender Git Loki

Fix T88877: 2.93: Crash on recent OSX with a non-English locale.

Looks like OSX changed the default format of its locale, which is not
valid anymore for gettext/boost::locale.

Solution based on investigations and patch by Kieun Mun (@kieuns), with
some further tweaks by Ankit Meel (@ankitm), many thanks.

Also add an exception catcher on `std::runtime_error` in
`bl_locale_set()`, since in OSX catching the ancestor `std::exception`
does not work with `boost::locale::conv::conversion_error` and the like
for some reasons.

Reviewed By: #platform_macos, brecht

Maniphest Tasks: T88877

Differential Revision: https://developer.blender.org/D13019