reintegrating translation branch

Merge branch 'translation_to_pt-br'
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
Merge pull request #101 from svogt/fix-message-properties

Add missing equals sign in GitBlitWebApp.properties
GitBlitWebApp_es.properties:
- Best translation in three phrases.
Merge pull request #102 from Mrbytes/master

Updated Spanish translation
Updated Polish translation for 1.3.1
Merge branch 'master' of https://github.com/gitblit/gitblit
Translation of lastest Strings up-do-date.
Tradução das últimas Strings até a data atual.
Merge pull request #103 from ljader/fix-polish-locale-for-1.3.1

Updated Polish translation for 1.3.1
Merge pull request #104 from rafaelcavazin/master

Update Brazilian Portuguese translation