MediaWiki uses a number of nonstandard codes which do not validate
according to the IANA language subtag registry. Some of them have
the wrong semantics entirely: MediaWiki's `sr-ec` variant maps to
BCP 47 `sr-EC` which is "Serbian as used in Ethiopia" (!).
Extend LanguageCode::bcp47() to map our nonstandard codes to valid
BCP 47 language codes. Export the mapping so that it can be used
in JavaScript's corresponding mw.language.bcp47() implementation
as well, and return the standard BCP 47 codes in the siteinfo
API.
Thanks to TheDJ (I10b4473c7e53f027812bbccf26bb47aec15fddfd) and
Fomafix (I93efc190714ba76247d30ba49fc21ae872fc3555) for previous
attempts at this!
Also removed a fixme for the name of 'Twi', dating back to 2004
(f59c3be23b) -- checking
tw.wikipedia.org it certainly appears that the autonym of 'Twi'
is correctly 'Twi'.
Tracking bugs for invalid language codes are T125073 and T145535.
Discussion of zh-XX => zh-HanX-XX mapping is at T198419.
This is a replay of an earlier merged patch,
8380f0173e, which had to be reverted
because it caused regressions in the Babel extension (T199941).
Bug: T34483
Bug: T106367
Bug: T120847
Depends-On: I27a5b8e45b34c6b57c1b612b11548001c88cd483
Change-Id: Iebbc604af21d7f2af9c1f1ab2574cb5f309bf6ed
This method encourages directly editing configuration variables. It's a
better idea to use setMwGlobals() (or other set wrappers) so that we can
be intelligent in the future, for instance resetting services after the
config change. Plus, a lot of the callers come out cleaner this way
anyway.
Depends-On: I8a1e81acc5c42a8d7f30938a72cface0acea4a70
Depends-On: I4105dbcf9c5399fe7239478c460ec57c015a98d4
Depends-On: I1b220996acf2f66cf7b0f092b341584663df32f9
Depends-On: Ie2d1ea65c0cb334bbde1666d00781474b7ac4dab
Change-Id: I23d77398e401f4986b1d5bd1c9e11a8a40da16f8
So callers don't need to do this manually. Pointed out by Tim in T201799.
Depends-On: Ia6c36d5a650095e35093bf47e275e081e89b3daf
Change-Id: Ida62767f3ca53f99609cae01d3a20051bb92ccab
