rename locale to lang in locate template middleware
rename locale to lang in locate template middleware

75team/thinkjs,akira-cn/thinkjs,maxzhang/thinkjs,maxzhang/thinkjs,snadn/thinkjs,75team/thinkjs,maxzhang/thinkjs,akira-cn/thinkjs,Qihoo360/thinkjs,thinkjs/thinkjs,75team/thinkjs,akira-cn/thinkjs