Keyboard settings should display numerical values for the sliders

[Dan Dascalescu]

Unlike other distros, the Keyboard settings dialog does not have numbers associated with the three sliders, so well-known settings for repeat rate and delay and blinking speed, can be entered precisely and quickly. For example, I know I prefer a delay of 200ms and a repeat rate of 30/second, but I have no idea what values the sliders set, and I can't test that easily either because there's no test box (bug #994580)

These are rather basic usability improvements and should be trivial to fix and contribute upstream to GNOME.