All translations

For example, you have a french lesson commented in english :
« "Bonjour" means "Hello" »
If you want to translate the lesson into italian it will be :
« "Bonjour" significa "Buongiorno" »

In this example the french language is the taught language and the english and spanish languages are the languages used to comment the lesson. "Bonjour" is kept untranslated.

a list of languages will follow this text

It's about a language lesson. There are 2 languages in the lesson : the taught language and the language used to describe and explain the lesson. "Language used to comment the lesson" represents the latest.

Means "the language you want to teach with this lesson".

This sentence means in other words: (The text has been) valdiated or edited for the last time by %s. %s is the name of a user that will be dynamically replaced when building the page.\r