Revert "Removed force_jquery.js."

This reverts commit 422c7aed74.

docs/modeltranslation/admin.rst

@@ -219,6 +219,7 @@ The proposed way to include it is through the inner ``Media`` class of a
     class NewsAdmin(TranslationAdmin):
         class Media:
             js = (
+                'modeltranslation/js/force_jquery.js',
                 'http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.2/jquery-ui.min.js',
                 'modeltranslation/js/tabbed_translation_fields.js',
             )
@@ -226,6 +227,9 @@ The proposed way to include it is through the inner ``Media`` class of a
                 'screen': ('modeltranslation/css/tabbed_translation_fields.css',),
             }
 
+The ``force_jquery.js`` script is necessary when using Django's built-in
+``django.jQuery`` object.
+
 .. note:: This is just an example and might have to be adopted to your setup of
           serving static files.
 

modeltranslation/static/modeltranslation/js/force_jquery.js

@@ -0,0 +1,3 @@
+if (!jQuery) {
+    jQuery = django.jQuery;
+}