generalize action to change the local and generate result.
Can you please elaborate it.
As per your requirement Language preference was change in back-end you can trigger the action and identify the language what is selected and display the content appropriate language.
ocjp 6 — Feeding a person with food is a great thing in this world. Feeding the same person by transferring the knowledge is far more better thing. The reason is the amount of satisfaction which we get through food is of only one minute or two. But the satisfaction which we can get through the knowledge is of life long.