- don't have a NOTIFY CONSTANT property
- the data is constant, so drop NOTIFY
- remove redundant signals
- remove setLabels() now it's only needed from one constructor
- Declaring namespace A::B is a C++17 extension, and Calamares
is C++14. Split the namespace declarations.
- While here, fix extra const warning as well.
- Use namespace CalamaresUtils::Locale consistently for this service.
- Move locale-related non-GUI support code from the Welcome module
to libcalamares; these are generally useful. Both Label (naming a locale)
and LabelModel (managing a bunch of those Labels) have been moved.