While the plugin is not updated by mmuro, and for whom the above code has not worked, either because of conflicts between jQuery and / or templates, here is a workaround:
In this direction download the JQuery Validator: http://bassistance.de/jquery-plugins/jquery-plugin-validation/. Click on the link "download" and save the zip file on your pc. Open the file jquery.validate.js or jquery.validate.min.js in a text editor.
Look for the text messages: required:" This field is required. At line 267 in the case of jquery.validate.js or line 20 in the case of jquery.validate.min.js (You can use any . The Jquery.validate.min.js is compressed and takes up less Kb)
In the downloaded zip file are translations of 41 languages, in a directory called "localization".
Open the file that corresponds to your language with a text editor and copy the text that is between the curly braces {} and replace the text with the English language in the Jquery.validate you have chosen above.
Once done, upload to the server the modified file in your theme directory or wherever you want.
Now we must choose between two options:
1 - Modify the code in visual-form-builder.php. (This option has the advantage that the load is done via the plugin and the disadvantage that in an upcoming changes will be lost)
Open the Visual-form-builder.php file and replace the url http://ajax.aspnetcdn.com/ajax/jquery.validate/1.9/jquery.validate.min.js on lines 321 and 331.
Looks like this: wp_enqueue_script ('jquery-form-validation "," h t t p://www.yoursite.com/wp-content/themes/yourtheme/jquery.validate.min.js', array ('jquery'),'' , true);
2 - Open your functions.php file in your theme where or create a new one. Copied to the last line before ?> The above code wp_enqueue_script ('jquery-form-validation "," h t t p://www.yoursite.com/wp-content/themes/yourtheme/jquery.validate.min.js' array ('jquery'),'', true); (This method reloads the script, but not affected by a new update)
This is a temporary solution and we are limited to a single language, but is simple and useful as the plugin is not updated.
Sorry for my English. I hope I have helped you. For me it works well: http://femcor.net/seguro-de-automoviles-solicitud/