License metadata - allow non-form-specific element help texts. (Bug #1095499)

Change the help text handling so that when a help text is not found for a
specific form/element combination, it also looks for a wildcard ANY/element
help text.

This is used by the license metadata feature to provide uniform help text for
the license fields on all forms where they appear.

Change-Id: I4c3f1a38d81ae54081e555b2296d28955329cf77
Signed-off-by: Jiri Baum <jiri@catalyst-au.net>

htdocs/lib/mahara.php

@@ -421,6 +421,12 @@ function get_helpfile_location($plugintype, $pluginname, $form, $element, $page=
             return $langfile;
         }
     }
+
+    // if it's a form element, try the wildcard form name
+    if (!empty($form) && !empty($element) && $form !== 'ANY') {
+        return get_helpfile_location('core', '', 'ANY', $element, $page, $section);
+    }
+
     return false;
 }