add substitute to Vancouver author date (#6147)

supersedes #6148 
See https://forums.zotero.org/discussion/98485/name-wird-im-zitiersil-nicht-eingefuegt#latest

Author: adam3smith

vancouver-author-date.csl

@@ -47,6 +47,16 @@
       <label form="long" prefix=", "/>
       <substitute>
         <names variable="editor"/>
+        <text variable="title" form="short"/>
+      </substitute>
+    </names>
+  </macro>
+  <macro name="author-short">
+    <names variable="author">
+      <name form="short" and="text"/>
+      <substitute>
+        <names variable="editor"/>
+        <text variable="title" form="short"/>
       </substitute>
     </names>
   </macro>
@@ -253,11 +263,6 @@
       </if>
     </choose>
   </macro>
-  <macro name="author-short">
-    <names variable="author">
-      <name form="short" and="text"/>
-    </names>
-  </macro>
   <macro name="issued">
     <date variable="issued">
       <date-part name="year"/>