About GPA and Teacher recommendations.

I have an issue filling the common app. As an international student (I am mexican) my school does not provide nor calculates GPA. However, I calculated mine and it is very attractive for the admission (4,0 unweighted). It was certified by Student Services at my school and everything. Should I put it?

Also, I have a struggle choosing who to invite for a teacher recommendation. As I am applying for an Engineering program at Georgia Tech, I deduce that my physics teacher (who knows me very well) is a good choice for a recommendation, the problem is that he does not speak english. On the other hand I have my literature teacher, who knows me well and speaks fluently english. The problem is that, literature has nothing to do with Computer Engineering! Who should I invite?