[FIX] web: encoding issue with moment locales

I don't quite get how it can trigger on user systems (as it apparently
requires resetlocale() to fail to set up an UTF-8-encoded-locale
somehow, disabling resetlocale() is how I could get the issue
triggered on my system), but anyway it's apparently possible for Odoo
to run with an ASCII system encoding, and it turns out Python 3 will
not use UTF-8 everywhere but will rather use whatever
locale.getpreferredencoding(False) yields, which in theory could be
completely bonkers.

This is an issue when using text IO with an implicit encoding, which
is what load_locale (/web/webclient/locale/<lang>) was doing.

* Fix by using binary IO
* Fix (2) by using direct-passthrough IO with specified encoding, that
  way we let the WSGI server handle the file streaming

Fixes #20075

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