requirements: make min and pinned proper release time files

These are no longer stored in the repo and are to be built at release
time.  So no longer any confusion about changing these files during
normal development.

Hopefully this opens up some more testing against current and latest for
us.
static: Add a js languages file

This file will be autogenerated by make linguas once some fixes are
upstreamed to TTK.
static, templates: Add a global language picker
profile: Remove ui_lang from the profile