As bam states the database and translator are built into the 3100, so you wouldn't free up any space by removing them. You can hide the icons for them to that they don't get in the way though:
Using the terminal app, type:
mv translator.desktop translator.desktop.hide
mv database.desktop database.desktop.hide
Actually I'm guessing at the last line as I don't have a 3100 in front of me right now. Type ls to see what's there if that doesn't work.
Once you've done that, just reboot the Z and the icons should be gone when you restart.