Remove Poedit

At this point, I wonder why we're still including Poedit in Tails.

Historically, we've included it to make it easier for people to translate Tails and our website from Tails.

Now that we have Weblate, does this still makes sense?

People could still install it using Additional Software, no? Or would we loose some specific config?

A tiny UX advantage is that we would get rid of the "Programming" Applications submenu.