Add zoom in/out with Ctrl + Numpad + or -

Hello, 

In certain keyboard layouts, such as AZERTY, which is the most common in France (among other countries), it's very easy to press Ctrl + + by accident (since the key with + is right next to backspace) and therefore zoom in. However, no keyboard combination exists to zoom out with this layout, since - is on the same key as 6 and Ctrl + 6 just brings you to the 5th server in your list. 

What is odd is that numpad + and - do not work for zooming in and out, and it would really make it easier if they did work, as right now i have to go into the settings each time to change the zoom.