zh_CN translation (70% coverage, Stage 3/5)

@gubatron I rebase my branch now and push it to myorigin from ubuntu shell (I did that in web broswser before ...). I am not sure if it's okay to merge, so my local status pasted as follows:

$ git remote -v
myorigin	git@github.com:eudaemon01/frostwire-desktop.git (fetch)
myorigin	git@github.com:eudaemon01/frostwire-desktop.git (push)
upstream	https://github.com/frostwire/frostwire-desktop (fetch)
upstream	https://github.com/frostwire/frostwire-desktop (push)
$ git branch -v
  master    661613a Fixes bugs with Transfers right click actions.
*zhCNtrans 4f3cf6d zh_CN translation (70% coverage, Stage 3/5)

If okay, I will delete the 'patch-1' branch ( the name is auto-named after editing zh_CN.po with firefox ).