TEXT LANGUAGE SUPPORT ON AMIGA 500

[JIM_PROTOS]

I WOULD BE GRATEFUL IF YOU COULD TELL ME HOW TO CHANGE THE TEXT LANGUAGE ON AN AMIGA 500.(SHIFT+ALT SURELY DOESN'T WORK).  I DON'T KNOW MUCH ABOUT AMIGAS BUT HAVE TO USE ONE AT WORK. THANKS IN ADVANCE!!!  

[JIM_PROTOS]

I'm not sure about the Amiga OS version. What I use the Amiga for is to lay a script (still titles or crawls) over a video clip (using a genlock). The script I create has to be either in Greek (I'm from Greece) or English. Is there a way to combine both languages, i.e. in a crawling message. I know I'm not very helping but it's all still quite mixed up in my mind ...