Actually it should be fairly simple and handled in an .inc file.
I can't test it at the moment, but download this file and go to your SWG directory and create a folder named 'ui' and then place that .inc file inside of it, then open it in a Notepad find the following line:
Then look right above it and you should see:
Change this to whatever you like. This will move the whole message block, you can find each of the system message locations in the Data/Composite blocks following this.
Just so it's more clear, I'll copy paste the block and mark the line: