gTranslate

With gTranslate you can translate any text in a webpage just by selecting and right-clicking over it. The extension uses the Google translation services to translate the text.

Features:

Translates from/to the following languages: Afrikaans, Albanian, Arabic, Belarusian, Bulgarian, Batalan, Chinese, Chinese (Simplified), Chinese (Traditional), Croatian, Czech, Danish, Dutch, English, Estonian, Filipino, Finnish, French, Galician, German, Greek, Hebrew, Hindi, Hungarian, Icelandic, Indonesian, Irish, Italian, Japanese, Korean, Latvian, Lithuanian, Macedonian, Malay, Maltese, Norwegian, Persian, Polish, Portuguese, Romanian, Russian, Serbian, Slovak, Slovenian, Spanish, Swahili, Swedish, Thai, Turkish, Ukrainian, Vietnamese, Welsh, and Yiddish. Option to automatically identify the language of the original text. Option to detect the "lang" attribute of the of the selected text (or the whole page). Option to set the destination language to the browser locale. Replace texts from input and textareas form fields. Image title or alt attributes can be translated too.