Wide Coverage Translation Demo: you can now reorder the application grammars

When selecting which application grammars to use for translation, after
pressing the "Grammars..." button, it is now possible to change the order
of the selected grammars by dragging them up and down in the list.

src/www/gfse/sort.js

@@ -17,11 +17,12 @@ function initialize_sorting(tagList,classList) {
     var sortable_class=listToSet(classList)
 
     function sortable(elem) {
-	return elem && (sortable_tag[elem.tagName]
-			  ? sortable_class[elem.className]
-			    ? elem
-			    : null
-			  : sortable(elem.parentNode))
+	return elem && elem.tagName!="INPUT" && elem.tagName!="BUTTON"
+	    && (sortable_tag[elem.tagName]
+		? sortable_class[elem.className]
+		? elem
+		: null
+		: sortable(elem.parentNode))
     }
 
     function move_element(elem,x,y) {