Hello,
The jQuery Form Validation and jQuery Form Plugin in already included in the js/plugins.js File but the issue appears to be with the Mixed Content present on your Page related to https:// . Please make sure that all the Links on your Page is https:// . Meanwhile, find the following code on your Page:
http://fonts.googleapis.com/css?family=Lato:300,400,400italic,600,700|Raleway:300,400,500,600,700|Crete+Round:400italic
and replace it with:
https://fonts.googleapis.com/css?family=Lato:300,400,400italic,600,700|Raleway:300,400,500,600,700|Crete+Round:400italic
This should definitely fix the issue. Hope this Helps!
Let us know if we can help you with anything else or if you find any further issues.