to make it easier to know which language those are for. Part-of: <https://gitlab.gnome.org/World/Phosh/squeekboard/-/merge_requests/671>
and clean up some layout-files. Part-of: <https://gitlab.gnome.org/World/Phosh/squeekboard/-/merge_requests/655>
Part-of: <https://gitlab.gnome.org/World/Phosh/squeekboard/-/merge_requests/650>