Users can enter a blocked URL into Google Translate, choose a language other than English, and paste the results into their browser, unblocked. They then just have to translate the page. This forum post has more info, a use-case, and the steps to take to block this with Web Filter & SSL Inspector: – https://forums.untangle.com/web-filter/39125-google-translator-bypasses-web-filter.html
You will need to install and configure the SSL Inspector application to inspect the Google traffic. In tandem with Web Filter, you can block the translator site and stop this behavior on your network.
Refer to this article for deployment of the SSL Inspector: https://support.untangle.com/hc/en-us/articles/216297238-Use-SSL-Inspector-to-Inspect-SMTPS-and-HTTPS-TrafficFollow