MediaWiki language inspector updates

* Add ULS, which was removed from VE core
* Add experimental mwlanguage module which adds ULS integration
* Hook in ULS to the existing language widget

Also update VE core submodule with changes:
* 1e92abe Generic language inspector

Bug: 47759
Change-Id: I325a4dcc316d0334fadfcaa46ad3acd45c6bf84b