the console command may depend on the keyboard language. You can find the specific keybinding by opening the RelicCOH.ini in the COH installation folder, using a text editor. The line should read:
Code
Console
consoleKey = CONTROL+SHIFT+GRAVE
You may edit the keybinding to whatever you want though, like
Code
Console
consoleKey = CONTROL+SHIFT+s
if you have problems with Grave (~).
To start the game in -dev mode you have to apply a starting option to the COH shortcut by rightclicking on the shortcut, opening the properties tab and add " -dev" at the end, so that it reads similar to:
Code
"D:\Games\Company of Heroes\RelicCOH.exe" -dev