I'm Mexican and I work as a PT Tech and do this ALL of the time. I didn't put it in my personal statement though. Instead, I wrote about my life experience and why I wanted to be a PT and talked about my mother going through PT and that I TRANSLATED for HER when she did her rehab... I then spoke about my job... so from there, they can see that I was born in Mexico, spoke spanish, translated for my mom....and work as a PT Tech. I feel like writing a statement down as "I'm experienced in translating" is less appealing than using an example.... BUT by all means... write about that event and how it was a great experience to do that as an observer.