Fix white on white text display

Julien LepillerFri Jun 05 22:57:06+0200 2020

b8b56e0

nani/app/furiganatextview/src/main/res/values
namelast commitdate
attrs.xmlAdd furiganaMon Apr 15 20:09:48+0200 2019
strings.xmlAdd furiganaMon Apr 15 20:09:48+0200 2019