Bilingualism - French/english

We have a requirement to support both languages for our users.  They work in the same project areas.

We are only concerned about the form data, etc.. and not the user's data input.

Currently this is somewhat supported out-of-the-box with users browser language selection. I say somehwat in that only some of the field headings, etc,, are/have been translated but not all.  We are also adding our own custom fields that also need to be translated dynamically.  That is, present either the french or english text based on browser language selection 

Has someone been able to implement this capability and if so how?  We have yet to get an answer to this from IBM aside from stating that you need to use either a French process or English one which is not the solution we need.