Support for a numeric input with both dot and comma as a valid decimal separator.
Support for a numeric input with both dot and comma
as a valid decimal separator.

Fixes Česká verze hustota filamentu #1705

prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r