Improve navigation for P&C mini
I am trying to unify the language menus across the site. I think P&C mini would also benefit from next/previous buttons.
The advantage will be that we will have a more unified appearance and less code to maintain.
Another improvement we could make is to add a fallback to English.
WIP branch: https://framagit.org/peppercarrot/website/-/commits/unify-language-menus
Unfortunately, the link structure is completely different from the main site, so I need a decent test data set - can somebody zip up a rendered version of the project and attach it to this issue? 2 episodes + 2 languages will do.