Change the default font

[gpetit]

Thanks to Jiří Podhorecký, the website is now translated in Czech.
Since this langage has specific caracters, we now have some a small problem

As Jiri mentionned in a message:

I noticed one thing that I often encounter when translating some web pages and software into Czech.

The font used incorrectly interpretes some specific Czech characters, such as "ž" "š" "č" etc... which are either
 interpreted by another font or are in a different face, usually visibly thicker. 

... to find a solution, maybe change font family or using the Lato and Roboto fonts. 

The problem has been detailed here (by Jiri in another project) : https://community.karrot.world/t/better-use-roboto-font/689

This problem should also appear in NoiseCapture ?

@nicolas-f