Catch MessageTooLongException

[EasyVector]

If in the chat your message is to long an exception in thrown. However this exception is not properly catched and acted on accordingly. here: https://github.com/nextcloud/spreed/blob/master/lib/Controller/ChatController.php L210 Then we can at least show it properly in the UI For internal reference: https://sentry.rullzer.com/sentry/nextcloud/issues/442/

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