z's bill session mapped to csl's chapter-number

Following : 59e31879fa (commitcomment-3989222)

chrome/content/zotero/xpcom/utilities.js

@@ -61,7 +61,7 @@ const CSL_TEXT_MAPPINGS = {
 	"number-of-volumes":["numberOfVolumes"],
 	"number-of-pages":["numPages"],	
 	"edition":["edition"],
-	"version":["version", "session"],
+	"version":["version"],
 	"section":["section"],
 	"genre":["type"],
 	"source":["libraryCatalog"],
@@ -80,6 +80,7 @@ const CSL_TEXT_MAPPINGS = {
 	"call-number":["callNumber"],
 	"note":["extra"],
 	"number":["number"],
+	"chapter-number":["session"],
 	"references":["history"],
 	"shortTitle":["shortTitle"],
 	"journalAbbreviation":["journalAbbreviation"],