Synapse is using the worng keyboard layout

So I got myself a razer mouse (Viper) and tried to use the customisation for the alternate keys on the mouse, but even if I'm not in english language and not using in windows the english language it's still being in the US layout of QWERTY and it's even worse that when I try to put for example " / " as a key directly from the symbols section, it just map the way to write the symbol with a US keyboard. Same with " : ", it just show me "Shift+M" like wtf ?? And so it obviously proceed to use "Shift+M" in this case and "Shift+!" in case of a " / ". I'm lost I need help as playing without these is making it hard as it's been 10 years I played like this