Use AbyssinicaSIL for Ge'ez and Tigre languages

See https://www.mediawiki.org/wiki/Talk:Universal_Language_Selector#Several_problems_with_web_fonts_31516
and https://github.com/wikimedia/jquery.webfonts/issues/29

Change-Id: I7a2853682f0a103e2ce7e459d2bd3097a21001ed