[Plugin: NextGEN Gallery] Editing Navigation Code For Imagebrowser in Next-Gen Gallery

Does anyone know where the navigation text is located for the Imagebrowser mode in Next-Gen Gallery?

I’m trying to change the navigation text from “Next” and “Back” to “+” and “-“, I’d also like to change the text from “image x from x” to “image x of x”.

I just can’t seem to find where this code is located. Anyone know?