Removing translateString forces using data-i18n attributes, to make sure we do not forget to set them. Missing data-i18n attributes is a problem with late loading where we can end up without translation, without text. Missing data-i18n attributes is also problem that strings will not be translated when changing language.
Fixes a bug in invite dialog, where remove password button was shown for non moderators.

Will disconnect on ConferenceErrors.VIDEOBRIDGE_NOT_AVAILABLE.
Show the same message when either JVB is not available or Jicofo
disconnects.

Grey filter will be applied to the remote video/avatar displayed on
"large" and a message indicating remote connectivity issues will be
shown on top of that.

There is sometimes problems with cache and late loading of the translations, this commit avoids showing translation key in the contactlist title, by moving the parameter into the code.

Uses the same display names in the contact list as in the thumbnails, for local and remote.

Removes storing avatarURL in localstorage and retrieving it.

The user can be in case where there is no audio or no video device at all, so removing the requested word from the message.