standards: Allow for duplicate @copyright Fixes #90
Merge remote-tracking branch 'origin/master'

* origin/master:
  MessageLink: add MobileFriendly
  signatures: implement feedback from pull request. make sure config is only saved in memory. add translation code.
  signatures: changed config name.
  singatures: added administrative option in dashboard to disable video embeds in sigatures, and added info message.
  Google Plus: Fixed the authorize uri and added specific options to override social sharing and social reactions.