Fixes issue #501 'I can choose the font Dyslexia in settings in books with text and it looks all right'. This is a partial fix. The font used is an open source Dyslexia font, so we might need to change the actual font file.
Merge branch 'master' of https://github.com/Notalib/LYT
Fixes issue #501 - moved font definations from lyt.css to screen.css
Merge pull request #597 from thomasbrix/master

Fixes issue #501: I can choose the font "Dyslexia" in settings in books with text and it looks all right.