[Plone-i18n] National characters break structured text

[sheep <plo...@sh...>]

I'm trying to use some Polish characters inside a structured text, and I 
found that they break it :(

Example:

*This is italic text* this works good.

*Zagęść gęślą jaźń* this does not.

I'm not sure whether it's a problem of Plone or Zope.

-- 
The Sheep