With release v4.0 release (July 16, 2017) the ability to choose fonts was removed. The one and only font (Open Sans) is quite unreadable if Anti Aliasing is switched off. Please think about people with handicaps which cannot use Anti Aliasing because of their eyes.

Please add at least one font (as Arial or Ubuntu from pre 4.0) or provide a simple description of how someone can do this for a local installation.