Technically speaking, translation involves written languages, while interpretation involves spoken(or signed) languages. http://www.translationcentral.com/translation_vs_interpretation.php

Translation is the process of translating words from one language to another. My grandmother only speaks Spanish, so I have to translate for her. Interpretation is explaining the meaning of something, and is more subjective. We each interpret our experiences and reality in a way that makes sense to each of us.

I think translation it depends on the dictionary whether interpretation depends on the person. so every person has their own interpretation.