Locale bus mechanism
systemd-localed.service
/lib/systemd/systemd-localed
systemd-localed is a system service that may be used as mechanism to change the system locale settings, as well as the console key mapping and default X11 key mapping. systemd-localed is automatically activated on request and terminates itself when it is unused.
The tool localectl(1) is a command line client to this service.
See the \m[blue]developer documentation\m[]\s-2\u[1]\d\s+2 for information about the APIs systemd-localed provides.
systemd(1), locale.conf(5), vconsole.conf(5), localectl(1), loadkeys(1)
developer documentation
http://www.freedesktop.org/wiki/Software/systemd/localed