Add Chinese translations for Stopwatch & Countdown

Patch Set 2
          Use unicode chars for copyright symbol
Patch Set 3
          1. Merge translation for http://review.cyanogenmod.com/#/c/22062/15 Patch 15
          2. Fix some translation by Andrew Jiang suggestion.

Change-Id: I868b592873f57afa52c1cf281c109e103aea8357