* src/dialogs/dialog-function-wizard.c (formula_guru_init_args): Use
locale dependent argument separator.

* src/func.h (function_get_category,
function_get_category_with_translation): Renamed args.

* src/func.c
(function_category_compare): Don't use g_strcasecmp, it's broken.
(function_get_category): Use function_get_category_with_translation.
(function_get_category_with_translation): Some code moved from
function_get_category, keep categories sorted by display_name, store
internal_name in "normalized" form (converted to lowercase).