Clean up glade file

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>
gitignore: ignore volumeicon binary

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>
gitignore: ignore Makefile.in.in

The file po/Makefile.in.in gets autogenerated by intltoolize so don't
track it.

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>