Merge pull request #11956 from gustavotrott/upload-maxsize-error

...tton/core/apps/presentationpod/PresentationPodHdlrs.scala

...s/presentationpod/PresentationUploadTokenReqMsgHdlr.scala

...pod/PresentationUploadedFileTooLargeErrorPubMsgHdlr.scala

...ton/core/pubsub/senders/ReceivedJsonMsgHandlerActor.scala

...n/scala/org/bigbluebutton/core/running/MeetingActor.scala

...c/main/scala/org/bigbluebutton/core2/AnalyticsActor.scala

...org/bigbluebutton/common2/msgs/PresentationPodsMsgs.scala

...b/src/main/java/org/bigbluebutton/api/MeetingService.java

...utton/api/messaging/messages/PresentationUploadToken.java

...igbluebutton/presentation/ConversionMessageConstants.java

...presentation/imp/SwfSlidesGenerationProgressNotifier.java

...tton/presentation/messages/UploadFileTooLargeMessage.java

...rc/main/scala/org/bigbluebutton/api2/BbbWebApiGWApp.scala

...eb/src/main/scala/org/bigbluebutton/api2/MsgBuilder.scala

...g/bigbluebutton/api2/meeting/OldMeetingMsgHdlrActor.scala

bigbluebutton-web/bbb-web.nginx

bigbluebutton-web/grails-app/conf/spring/resources.xml

...gbluebutton/web/controllers/PresentationController.groovy