Bug: Keyboard layout is not considered in the sign column

[jamilraichouni]

Hey, thanks for your plugin!

Just a quick note:

I work using a German keyboard layout:

When I set a mark with m0 I get a closing brace in the sign column and at the same time the mark is registered correctly:

mw to set a mark for w just works fine.

The character in the sign column does not consider the keyboard layout.