spellcheck - 2 languages?

[O. Sinclair]

One thing I wonder is if one can have the spellcheck working with 2 
languages. I frequently write mail in another language than English (and 
documents) and then the spellchecker, set to British English, is just a 
nuisance and not a help. If one could have it to use 2 languages that 
would be great! I once used Windows mailsoftware Barca and there you 
just had to install any dictionary and it would be used alongside 
default English.

Sinclair