Add an option to get only parent terms

Hi reinchek, thanks for your patch!

I went ahead and created an issue fork. The patch applied fine. I made some slight modifications (using $this->t() throughout the settings form now; made the description of the checkbox a bit more self-explanatory).

Feel free to take a look if you are happy with these changes.

Hi @marcoliver,
I fully agree with the proposed changes. Indeed, thank you for taking the trouble to look and fix those unclean portions of code!

Thanks! I merged the changes just now. New release forthcoming.

Great! thank you!

Automatically closed - issue fixed for 2 weeks with no activity.