Recommendation letters in other language Common App

Hi! So here is my problem:

The teachers that wrote the recommendation letters for me, wrote them in Spanish since they dont speak English, so they have asked me to translate them so they can submit the letter to the common app site. My question is, since the letters should be confidential and directly written by the teacher, how should the letters be translated? If I hire and official translator should I ask him not to certify it? like not writing " I therefore state as an official translator, based on the documents submitted to my person…", but just translate it phrase to phrase? Or what could I do in this case?

Im grateful for any advice on this matter,

Thanks

Why not ask the colleges directly?