only csl type to lowercase
only csl type to lowercase

ZotPlus/zotero-better-bibtex,retorquere/zotero-better-bibtex,ZotPlus/zotero-better-bibtex,retorquere/zotero-better-bibtex,retorquere/zotero-better-bibtex,ZotPlus/zotero-better-bibtex,retorquere/zotero-better-bibtex,retorquere/zotero-better-bibtex,ZotPlus/zotero-better-bibtex,retorquere/zotero-better-bibtex