Dutch translations

@loudenvier, thanks for creating kendo-global, it helped me with creating a solution to localize the Kendo controls in my AngularJS app.
Here are the Dutch (nl-NL) translations.
 
My app loads a JSON file with all the resources, and sets the labels for the KendoUI controls with it:

``` js
function initKendoLabels(){
	function extendKendoMessages(component, optionNames){
		for(var i = 0; i < optionNames.length; i++){
			var optionName = optionNames[i];
			kendo.ui[component].prototype.options[optionName] =
				$.extend(kendo.ui[component].prototype.options[optionName],
					Localize.labels.Controls[component][optionName]);
		}
	}

	extendKendoMessages("ColumnMenu", ["messages"]);
	extendKendoMessages("Groupable", ["messages"]);
	extendKendoMessages("FilterMenu", ["messages", "operators"]);
	extendKendoMessages("Pager", ["messages"]);
	extendKendoMessages("Validator", ["messages"]);
	extendKendoMessages("ImageBrowser", ["messages"]);
	extendKendoMessages("Editor", ["messages"]);
}
```

I think it might be a good idea to change the format of the localization files to something like this (1 object containing all the labels, + a simple function to set the labels from this object into Kendo).

I will open an issue about this idea where I will explain it further.