Navigate to valid URLs from any page

[meera-gd]

Currently, the password reset links and concept map links are only accessible when navigating to the link from a new browser tab (or from a different website). This is because these URLs are only processed in the DesktopUI::init() method. The user should be able to navigate to these pages even if they are already in the application.

[meera-gd]

There seems to be an issue with how Vaadin handles the '+' symbol in URI fragments. In DesktopUI.init() , Page.getUriFragment() correctly decodes the symbol as a plus. But in listeners attached to Navigator, Page.getUriFragment() incorrectly decodes the symbol as a space.

Because of this behaviour, the application is effectively unable to distinguish pluses from spaces in URLs. To work around this problem, URLs given to users (like the concept map URLs) should have '+' symbols percent-encoded as %2B. AuthenticationManager.makeSafeURL(String fragment) does this.