rightclick google translate.
This app adds an Item to chromes context menu when you selected a text then you can click on it to go to translate.google.com and see the translation of the word.
You also can change you default language from option page.
*** The toolbar you mentioned as SPAM (I agreed that and now its removed) was suggestion from a site to make it profitable.
I didnt know what they wanted to do with that.
I recover the extension so Its not SPAMing now and Its not doing anything with your privacy (its secure now.
You can see the code on github: https://github.com/ahmadalli/ChromeGTranslate/)