#JC-1364 Switched to 0.52 common version.
JC-1449 - Fixed: - Cancel button don't reload the page
- Tooltip about changing the logo is not shown if user is not Administrator
- Click on the logo opens main forum page
#JC-1428 Refactoring after code review.
#JC-1428 Correct displaying during preview.
JC-1404 fixed change mail validation
Merge remote-tracking branch 'origin/master'
Merge branch 'master' of https://github.com/jtalks-org/jcommune
JC-1449 - Fixed avatar flashing on page refreshing; mouse pointer of logo and forum name link
JC-1449 - Fixed translation
JC-1449 - Added comments
JC-1449 - Changed max length of forum parameters
JC-1449 - Changed max length of forum parameters (back to 255)
JC-1449 - Changed default logo file name, changed mechanism of reading default logo (ClassPathResource is used)
JC-1449 - Fixed logo tool tip showing for Administrator, fixed Administration dialog closing after click on 'close' button of the logo removing dialog
JC-1421 added attribute rel="nofollow" to user contact links
Removed wrong JavaScript inclusion to the topic form: jquery.ui.datepicker-ru.js
JC-1436 added empty password checks for register and edit forms
JC-1436 added tests for default string editor
added license headers
JC-1459 fixed redirect to new topic addresses