[PLT-4340] Channel Mute and "/mute" command #7617 (#7713)

* Add command and store changes to allow mute toggling

* Change channel muting to use ChannelMember notification structure

* Suppress email and push notifications for a muted channel

* Make i18n keys issue-compliant

* Add notification-cache handling for channel-muting

* Add channel handle for channel-muting slash-command

* Add unit test for mute command

* Merge branch 'master' into PLT-4340

# Conflicts:
#	app/notification.go

* Fix issue that command_mute responses will be overwritten

* Fix i18n key for channel muting

* Apply new Provider Interface to MuteCommand

* Migrate mute notification property to mark_unread

PLT-4340

* Make some i18n improvements for command_mute

PLT-4340

* Remove de.json translations

* Prevent push notifications when channel is muted

* Treat Group messages like Direct messages

* Fix unit test

* Send WS event when the channel member notify props changed

app/channel.go

@@ -482,6 +482,10 @@ func (a *App) UpdateChannelMemberNotifyProps(data map[string]string, channelId s
 	} else {
 		a.InvalidateCacheForUser(userId)
 		a.InvalidateCacheForChannelMembersNotifyProps(channelId)
+		// Notify the clients that the member notify props changed
+		evt := model.NewWebSocketEvent(model.WEBSOCKET_EVENT_CHANNEL_MEMBER_UPDATED, "", "", userId, nil)
+		evt.Add("channelMember", member.ToJson())
+		a.Publish(evt)
 		return member, nil
 	}
 }
@@ -1481,3 +1485,16 @@ func (a *App) GetDirectChannel(userId1, userId2 string) (*model.Channel, *model.
 	}
 	return result.Data.(*model.Channel), nil
 }
+
+func (a *App) ToggleMuteChannel(channelId string, userId string) *model.ChannelMember {
+	member := (<-a.Srv.Store.Channel().GetMember(channelId, userId)).Data.(*model.ChannelMember)
+
+	if member.NotifyProps[model.MARK_UNREAD_NOTIFY_PROP] == model.CHANNEL_NOTIFY_MENTION {
+		member.NotifyProps[model.MARK_UNREAD_NOTIFY_PROP] = model.CHANNEL_MARK_UNREAD_ALL
+	} else {
+		member.NotifyProps[model.MARK_UNREAD_NOTIFY_PROP] = model.CHANNEL_NOTIFY_MENTION
+	}
+
+	a.Srv.Store.Channel().UpdateMember(member)
+	return member
+}