Replace the constructor of Locale with a builder
We use them at least for BB 42562: Normalized the Accepted Languages on Android.
Upstream: https://bugzilla.mozilla.org/show_bug.cgi?id=1939823 (found by Thorin).
Also: https://bugzilla.mozilla.org/show_bug.cgi?id=1947475 (also found by Thorin).
Edited by Pier Angelo Vendrame