Fix aria-label value for localized Dialog

[Iankodj]

Bug report

Localization resources append text to the close button, but aria-label stays with value "Close".

Reproduction of the problem

http://runner.telerik.io/fullscreen/Icuno

Expected/desired behavior

WAI-ARIA:

• aria-label should be assigned dynamically to the messages.close property and eventually localized;

Localization:

• messages.close should not add text to the close button of the dialog

Environment

• Kendo UI version: 2016.3.914
• jQuery version: 1.12.4
• Browser: [all]