Subscribe to Question

As a user, I'd like to subscribe to some question to be notified about new answers

Acceptance criteria

• Button "Subscribe" on the top of the topic is shown in case if the user has not been subscribed yet;
• Button "Unsubscribe" on the top of the topic is shown in case if the user has been subscribed already;
• Buttons "Subscribe" and "Unsubscribe" are available in Q&A topic to any logged in user who has VIEW_TOPICS permission for branch with this Q&A topic;
• When user clicks "Subscribe" button, he should start receiving email notifications about the following actions concerning this Q&A topic:
  • Q&A topic was moved;
  • Q&A topic was deleted;
  • Any other user's answer was created;
  • Any other user's answer was deleted;
  • Own answer was deleted by other user.
• If VIEW_TOPICS permission was taken out from all user's groups, he should not receive email notifications concerning this Q&A topic until permission is granted again;
• When user clicks "Unsubscribe" button, he should stop receiving email notifications about any of the actions concerning this Q&A topic (except branch subscription notifications);
• Email notifications should be localized according to the current chosen subscribed user's language;
• If user has "Auto subscribe" checkbox activated in profile and he is Q&A topic starter, he would automatically subscribe to his new topic;
• If user has "Auto subscribe" checkbox activated in profile, he would automatically subscribe to the Q&A topic where he answered;
• If user has "Auto subscribe" checkbox activated in profile, he wouldn't automatically subscribe to the Q&A topic where he voted or left comment;

Localisation of the elements

• Button "Subscribe" localization:
  • English: "Subscribe"
  • Russian: "Подписаться"
  • Ukrainian: "Підписатися"
  • Spanish: "Subscribirse"
• Button "Unubscribe" localization:
  • English: "Unubscribe"
  • Russian: "Прекратить подписку"
  • Ukrainian: "Відписатися"
  • Spanish: "Cancelar subscripción"
• Tooltips for "Subscribe" button:
  • English: "Get mail notifications"
  • Russian: "Получать уведомления по почте"
  • Ukrainian: "Отримувати email про оновлення"
  • Spanish: "Recibir notificaciones por email"
• Tooltips for "Unsubscribe" button:
  • English: "Stop sending me mails"
  • Russian: "Прекратить подписку"
  • Ukrainian: "Не надсилати мені email"
  • Spanish: "Dejar de enviarme notificaciones por e-mail."