Added Korean translation gb.mergeToDescription and improved some strings

Dongsu, KIM

2014-03-08 f7e1ff4ddd3744ebebcdf4c37b2392ff34265d29

 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}