Provide feedback to the user when --reset is used otherwise it's not apparent that anything happened.
Change wording of a log message, it's there purely for the benefit of users not developers so word it accordingly
Use ClearSetting() instead of SaveSetting() with an empty value when reseting language andcountry with --reset
Save Language and Country settings as global settings and not per-host
settings. These were never meant to be host-based settings. This could
have resulted in applications running without the correct
language/country preferences on backends and slaves because changes to
the settings wouldn't have been propagated to those systems.

N.B. This doesn't fix existing systems. There will be a
followup commit to do this. In the meantime, running mythfrontend
--reset on all machines would remove the old per-host settings.