Use clever name for Top Left in Books

This information should be generated from the context (Test Page) itself.

bt5/erp5_run_my_doc/SkinTemplateItem/portal_skins/erp5_run_my_doc/boom.css.xml

@@ -198,7 +198,7 @@ table.lined td, table.lined th {\n
 @page :left {\n
   @top-left {\n
     font: 11pt "Gill Sans", serif;\n
-    content: "ERP5 Test creator";\n
+    content: "ERP5 Run My Docs";\n
     vertical-align: bottom;\n
     padding-bottom: 2em;\n
   }\n

bt5/erp5_run_my_doc/bt/revision

-11
\ No newline at end of file
+12
\ No newline at end of file