Hi

As you may know current embedded fonts don't have many non-latin characters.
Luckily adobe updated them and pushed new versions on github
https://github.com/adobe-fonts/source-sans-pro
https://github.com/adobe-fonts/source-code-pro

Inline image 1

Here is issue:
https://pharo.fogbugz.com/f/cases/16935/Source-Sans-and-Code-fonts-do-not-support-non-latin-characters-symbols-or-cyrillic

And slice:
SLICE-Issue-16935-Source-Sans-and-Code-fonts-do-not-support-non-latin-characters-symbols-or-cyrillic-AliakseiSyrel.1

Cheers,
Alex