prevent message sending if it exceeds max message limit setting

-----------------
[Geogit] // sent from France, Courbevoie [48.8967,2.2567] :FR:

client/lib/chatMessages.coffee

@@ -2,6 +2,7 @@ class @ChatMessages
 	init: (node) ->
 		this.editing = {}
 
+		this.messageMaxSize = RocketChat.settings.get('Message_MaxAllowedSize')
 		this.wrapper = $(node).find(".wrapper")
 		this.input = $(node).find(".input-message").get(0)
 		this.bindEvents()
@@ -65,7 +66,8 @@ class @ChatMessages
 			this.editing.saved = this.input.value
 
 	send: (rid, input) ->
-		if _.trim(input.value) isnt ''
+		if _.trim(input.value) isnt '' and not this.isMessageTooLong(input)
+			console.error 'sending', input.value
 			KonchatNotification.removeRoomNotification(rid)
 			msg = input.value
 			input.value = ''
@@ -185,3 +187,6 @@ class @ChatMessages
 		# ctrl (command) + shift + k -> clear room messages
 		else if k is 75 and ((navigator?.platform?.indexOf('Mac') isnt -1 and event.metaKey and event.shiftKey) or (navigator?.platform?.indexOf('Mac') is -1 and event.ctrlKey and event.shiftKey))
 			RoomHistoryManager.clear rid
+	
+	isMessageTooLong: (input) ->
+		input?.value.length > this.messageMaxSize
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