Added some instruction about the translation of variables Simplified building prerequisites
Added some instruction about the translation of variables
Simplified building prerequisites

mwoz123/koreader,Frenzie/koreader,frankyifei/koreader,chihyang/koreader,pazos/koreader,koreader/koreader,NickSavage/koreader,ashang/koreader,apletnev/koreader,Frenzie/koreader,NiLuJe/koreader,poire-z/koreader,chrox/koreader,Markismus/koreader,mihailim/koreader,ashhher3/koreader,noname007/koreader,Hzj-jie/koreader,houqp/koreader,robert00s/koreader,NiLuJe/koreader,poire-z/koreader,koreader/koreader,lgeek/koreader