The TemplateData extension for MediaWiki has two main JavaScript components:
The latter has developer documentation on MediaWiki.org in addition to the docblocks within the code.
Utility functions for querying language data.
Copyright (C) 2012 Alolita Sharma, Amir Aharoni, Arun Ganesh, Brandon Harris, Niklas Laxström, Pau Giner, Santhosh Thottingal, Siebrand Mazeland and other contributors. See CREDITS for a list.
UniversalLanguageSelector is dual licensed GPLv2 or later and MIT. You don't have to do anything special to choose one license or the other and you don't have to notify anyone which license you are using. You are free to use UniversalLanguageSelector in commercial projects as long as the copyright header is left intact. See files GPL-LICENSE and MIT-LICENSE for details.