fix CDOJ-UI gitmodule URL.
Merge pull request #2 from pfctgeorge/fix-submodule

fix CDOJ-UI gitmodule URL.
update ui submodule.
Merge pull request #24 from pfctgeorge/fix-submodule

update ui submodule.
fix choose language in problem show.
Merge pull request #25 from pfctgeorge/hotfix-choose-language

fix choose language in problem show.
add init-params to jetty configuration to fix symbolic links.
Merge pull request #29 from pfctgeorge/fix-symbolic-links

add init-params to jetty configuration to fix symbolic links.