d/patches: Fix locale selection on Librem 5
* pages: language: Force locale setting via localed on Librem 5
* cc-common-language: Fallback to en_US.UTF-8 also for C.UTF-8
* gis-driver: Fallback to en_US.UTF-8 on invalid locale
* gis-language-page: Call language_changed in page_apply
This still doesn't allow to select a custom (non-pregenerated and non-hardcoded) locale, but at least choosing one from the already existing list will work now.
Edited by Sebastian Krzyszkowiak