add a Chinese translate string

Stardrad Yin

2014-03-09 2c84a191eb53b27d3a16062749e2f18505f27494

 src/main/java/com/gitblit/wicket/pages/propose_git.md

@@ -2,5 +2,5 @@
    cd ${repo}
    git checkout -b ${reviewBranch} ${integrationBranch}
    ...
    git push --up-stream origin ${reviewBranch}
    git push --set-upstream origin ${reviewBranch}