If you're not satisfied with the amount of languages dict.cc (the website) offers, then this add-on clearly is not for you.

All languages available on the website can also be used in the add-on. No reason to give the add-on a bad rating.

Dict.cc is indeed limited, as the first language has to be english or german. But there are a lot more to choose from for the second language: https://browse.dict.cc/

Of course this does not come close to the quantity of languages google offers, but it does yield better results in my opinion.

I hope this helps.