Joe Gold is right, most of the time people come out with instant messages or emails in a language they don't know... and ask for a translation. Let's say people don't know exactly what's going on in written stories but they may doubt about it.
To sum up the whole thing, most of you would translate, which makes me happy finally... although it depends on the context and the possible "roughness" of the text.
to all translators, remember you are always free to translate or not
