The message MediaWiki:Mwe-upwiz-source-thirdparty-license ends with the word "license(s)" which should be avoided by adding another parameter:
$2 - number of items in the list following the message.
I tried to amend the source myself but was unable to spot the place where the message is being used in the svn repository.
Version: unspecified
Severity: trivial
URL: http://www.mediawiki.org/wiki/I18n#Pass_number_of_list_items_as_parameters_to_messages_talking_about_lists