figure out a way to generalize the prompts by using something like ${language}

[drorm]

Looking at our prompts, many of the specify a behavior for a specific language. Now that users can change prompt, they can go ahead and change the language on their own, but it'd be cleaner if once the user has chose a language, all the prompts would just work out of the box, grabbing the language from the user's choice.
The challenge is that we have the language in several places:

• In the prompt itself, something like "I want you to be a French" teacher ...
• In the choice that the user made: fr-fr
  and possibly other places.
  Need to see how we can make one choice, affect these.