change lib longDate to format('llll')

.relative-date title is a random string generated by momentjs. The title attr just shows *tr早上n92014年4月7日早上tion 41i09ing: 1_CN.1早上t19.2014年4月7日ong_1早上t1*. This is because of a locale missing. 

Though I have no idea about what's going on here, I manage to get it work as expected. Now its title is *2014年4月7日星期一早上1点41* which is correct.

I suspect longDate is the same as format('llll') here.