Some RIS changes

Commit messages should be self-explanatory

Addresses:
https://forums.zotero.org/discussion/35592/journal-series-omitted-in-jstor-import/
https://forums.zotero.org/discussion/35455/endnote-import-how-to-map-label-to-library-catalog/
https://github.com/zotero/translators/pull/698 (the mess with changing tags)

CC @zuphilip