repair bug in control panel vocabulary for stylesheet choices, when the stylesheet name contains non-ascii characters
update the apa stylesheet to the very very latest as found on zotero.org rather than in the repository
map ArticleReference to 'article-journal' to work around omission of the general article type in the APA6 stylesheet (see https://github.com/citation-style-language/styles/issues/911#issuecomment-40029359)

refs jazkarta/ump-buildout#78