Making Your Website Multi-Language Supportive

hi,

am just wondering, my website, www.crystalcore.nl - currently only supports english, I am working on a dutch translation but this only works for my content pages.. things like menu's and short words in templates are still english and I cant think of a simple way to have some kind of database for different languages..

so my question, does anyone know of a good technique to make your site multi-language supportive?

thanks in advance..