- only widgets get language change events, so we need to
hook that up to the ViewSteps and inform the Config
object so that it can (re)load translations for the
keyboard data.
- Use the just-refactored XKBListModel to store the xkb key-value
pairs for variants, drop most of the complicated implementation,
store just a single list of values.
- point to main Calamares site in the 'part of' headers instead
of to github (this is the "this file is part of Calamares"
opening line for most files).
- remove boilerplate from all source files, CMake modules and completions,
this is the 3-paragraph summary of the GPL-3.0-or-later, which has
a meaning entirely covered by the SPDX tag.
