reintegrating translation branch

Merge branch 'translation_to_pt-br'
Update Chinese translate @ version 1.30
Merge pull request #94 from yin8086/Chinese

Update Chinese translate @ version 1.30
Ensure Keys class is included with all builds
Documentation
Added unit test for reported issue (issue-271)
Fixed bug with adding new local users with external authentication
Prepare Dutch resource for translation
Documentation
Updated Dutch translation
Fixes findbugs warning - dereferencing null in exception case
Spanish translation:
- Improved translation
- Translated to the rev. 1.3.1

Signed-off-by: mrbytes <eguervos@msn.com>
Merge branch 'master' of https://github.com/gitblit/gitblit
Update Korean Translation
Merge pull request #98 from simonharrer/close-resources-correctly

Fixes findbugs warning - dereferencing null in exception case
Merge pull request #99 from Mrbytes/master

Updated Spanish translation
Merge pull request #100 from ds5apn/master

Update Korean Translation
Implemented optional page caching
Fixed missing clone url on the empty repository page
Add missing equals sign in GitBlitWebApp.properties