Hand-written text will not be translated in the sense that you'd suddenly write a different language, but looking at a foreign hand-written language would leave someone with a vague understanding of what it means. However, if the writer is intentionally writing in their own specific language, then others who don't know the language would be unable to understand it.

It's a bit of a gray area- we'd like to keep things as open to interpretation for potential plotting as possible. Please let us know if you have any further questions!