Correctly sort categories in NickView
Categories need to be sorted by priority rather than alphabetically.
#1 Updated by Sputnick about 15 years ago
GRUMM has been extended to support a TreeModel::SortRole.
Prettified and correctly sortified user categories, closing BR #93. Translators can now
add different strings for singular and plural.
WARNING: make distclean is mandatory, else strange things WILL happen!