[fortheDeclaration]

All the modern versions have 'slaves' instead of 'servant'.

They are all wrong.

A servant has a will to serve or not, the slave doesn't.

We are either servants of sin or of Christ, WE make that choice (Rom.6)

[OHelix]

All the modern versions have 'slaves' instead of 'servant'.
They are all wrong.

I don't think they are wrong. The word DOULOS means chattel slave. It most certainly does not mean a free man who is merely a subservient employee.