Translate Safari Extension for Mac adds Google Translate to a context menu within Safari, allowing for on-the-fly Web site translations without ever having to navigate away from the site.
The extension adds a button next to the address bar; but poking around in the Preferences panel, we found it possible to add translation to a right-click context menu. We also set it so that translated pages appear in new tabs, rather than replacing the page in the current tab, and selected English as our default language. We directed our browser over to a page in French, right-clicked on "Translate this Page," and a new tab opened, showing us the Web site translated into English. The accuracy of the translation is dependent on Google, not the extension, but we found the translations to be practical, though not exact.
Translate Safari Extension for Mac streamlines the process of using Google Translate into a single click of a mouse button. Anyone who uses Google Translate a lot would appreciate the functionality of this extension.
From Side Tree Software:
Translate Safari Extension provides a toolbar button and contextual menu item that allows you to quickly translate the page you are in using Google Translate. Once installed, see Safari Preferences > Extensions > Translate for settings.