Is their a way to switch languages after you have already chosen one?

[Yuri05 20]

I learning Spanish and i'm trying to switch everything digital to Spanish but can't find like a switch language button in settings.

[ch1046 1]

it should be one of the top options to chose from (i use the google play version on a chromebook) 

but depeding on the version it may not be there. Do you have a demo version that might have a role in it too.