add Ox.formatBoolean

static/js/oml.js

@@ -230,6 +230,9 @@
             script = document.createElement('script');
         script.onload = function() {
             Ox.load({UI: {theme: theme}}, function() {
+                Ox.formatBoolean = function(value) {
+                    return value ? 'yes' : 'no';
+                };
                 Ox.formatUpper = function(string) {
                     return string.toUpperCase();
                 };