Blocking a URL path is only possible for unencrypted sites, i.e., the URL that starts with http://…, not https://…
For encrypted sites, the router only sees the domain name, not the path following the domain name. Therefore, it cannot block a sub-section of a domain.
That said, you can block translate.googleusercontent.com instead of translate.google.com. That’ll block translation of sites while allowing translation of words.
