Locale menu should validate current locale

[jaimeiniesta]

https://beta.elixirschool.com/klingon makes it think like we're supporting that language, but we're not :D

[kinson]

😲 good catch! If you are not already working on a fix, I'll take a look this weekend. @doomspork my assumption is that we would want to redirect the user to / if they try to navigate to a locale that does not exist.

[jaimeiniesta]

@kinson please go ahead with this, I didn't plan on fixing it yet. Both redirecting to / or defaulting to the en locale sound good to me.