Visit Google Translate from the context menu.
Select the text you want to translate, right-click and click the "Translate ..." item in the context menu.
Banana Translation auto-detects the language of the selected text and opens a new tab with the translation in the language of your choice.
To access the options, visit chrome://extensions/
If you like it, please rate it.
Open-source: https://github.com/dlkb/Banana-Translation
My other extensions:
- Wikipedia Lookup - Browser Action
- Wikipedia Lookup - Context Menu
- Backxtab
- Keep It Tidy
- Upupup