A userscript to enable switching between languages on Google Translate using the tab key. This is especially useful for Safari, as Google Translate's language swap key (Cmd+Shift+S) conflicts with Safari's keybinding for saving a webpage.
A Greasemonkey compatible userscript manager, such as Tampermonkey (available for Safari).
Install the script by visiting user.js and adding it to your userscript manager. Focus the text input box, and press tab to swap laguages.