What is the languages used in creating CODE PROJECT? + What is the best languages to develop Questions and Answers website?

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what is the languages used in creating Code Project?

A bunch of 'em: English, Australian, and French.
PLus the usual culprits: C#, Javascript, a huge pile of SQL, and some JS frameworks, I believe.

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best choice of languages to develop Questions & Answers website

It sounds silly, but ... the one you know best and are most comfortable working in. Plus Javascript, SQL, probably some JS frameworks (again, probably thE ones you are most comfortable with).

So if you are well versed in PHP, use that. If C# is your bag, it's a no brainer. Even VB will do, if you must. Provided it works as a webserver language, is supported by your hosting service, and you are proficient in it, it'll do.
Trying to use a language you aren't familiar with is going to add a large learning curve to the whole project.