Language translation workflow - configure fields to be translated

We are looking at using the language translation workflow mechanism and have tested a few language copies using the Microsoft translator.

The seems to work pretty well but we have noticed that not all content is being translated.  We have one component that is pretty much identical to another save for the fact that the title field is called 'DisplayText' On one it translate but on the other it doesn't.

I'm assuming there may be a config somewhere that you can give a list of properties to be translated.

Is this tre case, or can someone point me in the right direction.

Thanks