Returns the value associated with
group_name translated in the given
locale if available.
locale is null then the current locale is assumed.
locale is to be non-null, or if the current locale will change over the lifetime of the
KeyFile, it must be loaded with g_key_file_keep_translations
in order to load strings for all locales.
key cannot be found then null is returned and throws is set
to KEY_NOT_FOUND. If the value associated with
cannot be interpreted or no suitable translation can be found then the untranslated value is returned.
a group name
a locale identifier or null
a newly allocated string or null if the specified key cannot be found.