UML reference cardinality font is ugly when converting to pdf or png

Hello,

When exporting a UML-style schema into PDF or PNG the font for cardinality designations seems to be broken: it is too bold, barely readable and constrasts with the font of tables. 

Would it be possible to make fonts in exported files look exactly as they do in the application itself? For now the workaround is to take a screenshot of the browser window, but it works only for schemas which fit to the screen.

P.S. I am using Chrome 62 on Ubuntu 16.04 x64.

When Editing:

When exporting into PNG or PDF:

Thank you!