I want to change the SmartTV language to a language other than English
Model 22pfl4208k/12

How to that? The TV menu is already set to a non-English language

YouTube App picks language settings from Smart TV. I want to chose the language that YouTube uses

When I use Internet appllicatio, example for Spanish, only channel names are in Spanish. everything else stays in English
https://www.youtube.com/tv?hl=es-ES#/