This one is easy. (I'm going to do do this assuming you have the legal English version.)
Go to Window_Base, and find line 175. It should look like this:
text = "[Normal]"
Change it to this:
text = "Normal"
Next, find line 179. It should look like this:
text = "[" + text + "]"
Change it to this:
text = text
That'll make it display without brackets. You could clean up the code even more by removing the if/else statement, but that's for you to do if you know what you're doing. Enjoy!