app: fixed icon on submit button

js/erp5_loader.js

@@ -2501,10 +2501,10 @@
         "type": "span",
         "direct": {
           "className": "ui-li-icon ui-li-icon-custom ui-icon-" +
-            spec.icon + " ui-icon"
+            (spec.icon || spec.value) + " ui-icon"
         },
         "logic": {"text": "\u00A0"}
-      }), "ui-li-has-icon"];
+      }), " ui-li-has-icon"];
 
     // main link, split button
     // TODO: make icon generic! what about util.class_string