HolaTranslator

Hola Translator for Safari allows you to translate text and pages in the Safari browser. It also adds the macOS system translator for fast text translation.

The built-in extension adds a button to the Safari browser toolbar. You just need to click on the translate icon when you want to translate the page you are visiting.

The extension also automatically detects the language of the page you're on, based on the language used for the Safari browser interface. You just click the Translate Page button on the pop-up to have all the text on the page appear in the new language.