No text when browser preferred language neither “es” nor “en”.

[AlbertoGP]

If the browser has a language different from “es” or “en” as first option, even if their second option iss one of them, the page text fails to load.
For instance, let’s say that my list of preferred languages is ["de", "es", "en"]: the current page will try to load the content for "de" which doesn’t exist, and then the page will have not text, just images etc.