translate hightlighted text and put the translation in a glossary book.
Translate selected text on context menu.
Translation will be shown, can be added to a glossary notebook by clicking '+' button or pronounced by clicking the speaker button
View the vocabularies in extension popover
The vocabularies can also be edited, exported/imported and read aloud repeatedly
Set the language source and target in extension popover
The translation is achieved by google translation free API.
