It appears that language setting should not be per widget / object on
the screen, this would require every single to store a language string.
Even though it would be cool to have language per widget, it does not
make much sense, since a UI in general has one language, if you want to
have a specific language on a object, then you can set the language
directly. This now keeps the language property on the edje canvas, which
does not force it to each and every object.
Depends on D7720