The screenshots that are uploaded by the latest builds of the VisualEditor language screenshot job have pixelated fonts.
Compare:
- Current, pixelated: https://upload.wikimedia.org/wikipedia/commons/f/fe/VisualEditor_Toolbar_Headings-en.png
- Older, non-pixelated: https://upload.wikimedia.org/wikipedia/commons/archive/f/fe/20141203163056!VisualEditor_Toolbar_Headings-en.png
This may be happening because on the clients where the test jobs run there is a problem with the screen driver or maybe fonts anti-aliasing is disabled. Either the configuration of this client machines must be fixed, or the tests must run on a different platform, maybe Mac. (But it must be tested that they have fonts for all the languages, in particular Arabic, Japanese and Hebrew.)