The uiLanguage() function was used for two purposes: to initialize
the language related preferences and to read the current language.
To make things more easy to follow, split this function in two:
one for initializing, one for getting the current language.
Moreover, don't return the current locale in an out-parameter
as there is already a function to do that [getLocale()].
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
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