some googlebooks urls start with "https://encrypted.google.com/books"

(noticed this while using HTTPS Everywhere)
Commenting out language detection error + minor editing of error messages.

This error message seems to be somewhat confusing. At least it should
only be shown when the detected language differs from wiki-language.
"google.com/books" --> ".google.com/books"
Turned off language

Generated citation will not have language parameter anymore.
It was removed due to the high risk of error.
If this feature is going to be implemented in the future, the user should
 be able to easily notice and correct it.
minor change in http error message