add chinese language config file: config/lang/cn.json
add chinese language config file: config/lang/cn.json

9590/express-admin,iooly/express-admin,lrAlval/express-admin,9590/express-admin,iooly/express-admin,simov/express-admin,julianromera/express-admin,lrAlval/express-admin,simov/express-admin,julianromera/express-admin