Language Switcher widget may still use deprecated settings

[tfrommen]

As of MLP 2.2.0 the language switcher settings for text and flag information has changed (see #112). Unchanged old settings, however, use, of course, the old and now deprecated values. This is no actual problem as we adapt these deprecated settings in the internally called Mlp_Helpers::show_linked_elements() method, but having the MLP core code trigger a PHP Notice (due to _doing_it_wrong()) is suboptimal.

The best solution most probably is to update and adapt the settings in both the widget's form and widget methods.

[tfrommen]

Closed with 2298842.