fix(windows): Trigger language sync after changes

Fixes #4447.
Fixes #4222.

The symptoms for these two issues are related: the language associations
change and keyboards stop functioning correctly. The issue is described
in detail in #4447.

Although this fix should be considered 'experimental', we should
probably include it in the release of 14.0, because it fixes a
longstanding issue with Keyman and Windows languages.