bpo-31159: fix language switch regex on unknown yet built languages. … #3051
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…(#3039)
This fix a regex issue (a missing non-matching group around an 'or'
list) and the specific possible case where a translation is built but
not yet in known by the picker, but not explicitly listing possible
languages in the regex.
(cherry picked from commit 122081d)
https://bugs.python.org/issue31159