If there are only two languages, show the other

Problem/Motivation

If there are only two languages, it is not so helpful to see what I am already knowing: the language I am currently reading ... then have to open a menu to select the other language. I know it is an edge case for bilingual sites.

Could there be an option to exchange the language displayed to the language currently not active: So that it would be just one click to switch to the other language.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes