Drop glibc-nsswitch-Add-group-merging-support.patch, applied upstream.
Drop glibc-rh1252570.patch, alternative fixes applied upstream.
Adjust glibc-rh1315108.patch to minor upstream change.
Update SUPPORTED file.
Locales, translations, and locale sources are split into
distinct sub-packages. A meta-package is created for users
to install all languages. Transparent installation support
is provided via dnf langpacks.