Terminal shortcuts in xfce

I'm alternating between working on KDE Konsole and an Xfce terminal. I'd like to make keyboard shortcuts as consistent as possible for my muscle memory. In particular, I'd like to be able to switch between tabs in the same terminal window by doing Shift-Left and Shift-Right, as on Konsole. From elsewhere on the web, I found that I should update

~/.config/xfce4/terminal/accels.scm

to contain

(gtk_accel_path "Actions/terminal-window/prev-tab" "Left")
(gtk_accel_path "Actions/terminal-window/next-tab" "Right")

However, after making this change, nothing happens when I do Shift+Left or Shift+Right. I've tried obvious things like opening a new terminal and so forth. Any ideas for next steps in debugging?