use same validation rules for user and group names

--HG--
branch : issue-470
close branch issue-470

--HG--
branch : issue-470
extra : close : 1
merge with issue-470
Use of navigation title instead of tab title
Merge with issue-470
Use variable for text in filter label for internationalization and localization.
use work directory instead of temp directory for scm-manager webapp

--HG--
branch : issue-464
close branch issue-464

--HG--
branch : issue-464
extra : close : 1
merge with branch issue-464
Merged sdorra/scm-manager into default
Use variable instead static text in tab for internationalization and localization.
use full message instead of short message for git commits

--HG--
branch : issue-474
Spanish translation.
This translation is based in german translation by Ahmed Saad (https://bitbucket.org/sdorra/scm-manager/commits/fd4a0b06f584ee6239b81059a134c11f1362642e).
merge with bracnh issue-470

--HG--
branch : issue-476
retry delete up to 5 sec to fix problem with windows locking

--HG--
branch : issue-476
close branch issue-476

--HG--
branch : issue-476
extra : close : 1
merge with branch issue-476
remove setContentLength with -1 to fix CGI on jetty 9, see #481

--HG--
branch : issue-481
close branch issue-481

--HG--
branch : issue-481
extra : close : 1
merge with branch issue-481