Option to indicate to users the reason why they can't record

[mconf-daileon]

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Author Name: Leonardo Daronco (Leonardo Daronco) Original Redmine Issue: 1735, http://dev.mconf.org/redmine/issues/1735

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When a user can't record a conference the record button is hidden from the user. However, in some cases it would be interesting to tell the user the reason why he can't record. This decision is up to the integration that is opening the conference, and it might wish to disable recording for different reasons. Ideally, this reason should be configured per user, since users might have different reasons for not being able to record.

One idea to implement this is:

• Add the option to pass a "record disabled reason" when a user joins a conference
• If a reasons is passed, the client should show the record button, but disable it and add a tooltip/notification with the reason.
• If a reasons is not passed, the the client should behave as it does today (which includes hiding the record button if the user cannot record).