systemd-localed.service, systemd-localed — Locale bus mechanism
systemd-localed.service
/usr/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 
                developer documentation for information about
                the APIs systemd-localed
                provides.