Use bigger default margins for printing

[KjellMorgenstern]

Problem

The margins for printing are quite small, and in some configurations,
part of the graphics get cut.
it is already possible to manually set margins during printing, but would be
better to have defaults that work in as many configurations possible.

Proposed Solution

• Increase default margins.
• Also make sure that default paper sizes are localized (A4 does not print nice on US Letter and vice versa)
• Maybe add a shortcut button to center the print on the page?