WebComment: link to "Your Comments" after posting
WebComment: link to "Your Comments" after posting

* After a user has submitted a comment, display a hint regarding
  the possibility to view all previously submitted comments
  in "Your Comments" page.

* Link opens in a new window/tab as a quick measure to prevent
  double posting when using browser's back button.

Signed-off-by: Jerome Caffaro <48b2bca20d17f7e0da978ba8575800a8c4a84744@cern.ch>

tiborsimko/invenio,tiborsimko/invenio,inveniosoftware/invenio,inveniosoftware/invenio