Using variables in translation strings with Brail

Question

Hi,

I'd like to build a localised web app with MonoRail and Brail. http://www.castleproject.org/monorail/documentation/trunk/usersguide/... describes how to translate basic strings, and I can do that. However I'm struggling with translation strings containing variables like:

Welcome ${user}

This renders

Welcome ${user}

instead of the desired e.g.

Welcome John

Any hints or ideas on how to achieve this?

Thanks, Dominik