Is trados a really bad translation software????

I have spend two weeks looking for a solution to this problem,

I have tried different approaches, including editing the segment rules, but nothing in trados can solve my problem.

My request is a very simple request: 

day -> Tag
world -> Welt

And you want a source segment to be roughed into a target segment in this fashion:

Hello World, have a nice day. -> Hello Welt, have a nice Tag.

Why can't trados add a button to achieve this? will trados ever achieving this in our lifetime???