getLocaleForKey
Returns the actual locale which the result of g_key_file_get_locale_string() or g_key_file_get_locale_string_list() came from.
If calling g_key_file_get_locale_string() or g_key_file_get_locale_string_list() with exactly the same @key_file,
Return
the locale from the file, or null if the key was not found or the entry in the file was was untranslated
Since
2.56
Parameters
groupName
a group name
key
a key
locale
a locale identifier or null