Returns the value associated with @key under @group_name
translated in the given @locale if available. If @locale is
%NULL then the current locale is assumed.
If @key cannot be found then %NULL is returned and @error is set
to #G_KEY_FILE_ERROR_KEY_NOT_FOUND. If the value associated
with @key cannot be interpreted or no suitable translation can
be found then the untranslated value is returned.
Returns the value associated with @key under @group_name translated in the given @locale if available. If @locale is %NULL then the current locale is assumed.
If @key cannot be found then %NULL is returned and @error is set to #G_KEY_FILE_ERROR_KEY_NOT_FOUND. If the value associated with @key cannot be interpreted or no suitable translation can be found then the untranslated value is returned.