Switch the page to another language, by the name the site shows ("Deutsch") or by its code ("de"). The step uses the language chooser of the page; when the page has none and the toolbar shows, it uses the toolbar's "Language" menu.
Examples
When I switch the language to "Deutsch"
When I switch the language to "English"
And we switch the language to "de"
When switch the page language to "Deutsch"
And we switch the site language to "en"
Pattern
When(/^(I |we )*switch the (?:page |site )?language to "([^"]*)"$/, …)
Part of @webship-js/django-cms-steps (github.com/webship/django-cms-steps), a step pack for Webship-js 2.0.x.