Caps lock now used to switch languages (I can't get rid of it)

I had a problem such as this for a long time, and the GNOME settings didn't work. If you're still stuck, try

setxkbmap us

Provided that works, but it's not persistent between sessions, try putting it in ~/.bashrc or something.

As per Permanently set keyboard layout options with setxkbmap in gnome/unity, GNOME may be resetting the keyboard map. In that case,

gsettings set org.gnome.settings-daemon.plugins.keyboard active false

would have to be used. You may also look to that page for a less temporary setup if setxkbmap us does work.

Sorry about getting to you so late; I've been wanting to answer this question for months, but it has only been recently that I have both known the answer, could find this question on Google, and have had a desire to answer it.

As such time has passed since I came up with my solution in Gnome, I have moved on from Gnome, so I have unfortunately been unable to verify that my memory regarding my solution is correct.

go to control panel- language and region- change input methods- advanced settings- change language bar hot keys