to both question. I am pretty sure: yes, but to be 100% go to mantano support site and ask them directly.
https://mantano.desk.com/
from that link you can download the user manual which shoudl provide more answers.
PS only the premium version allows you to see all notes/highlights across all books in a single view.
I know that you can add dictionaries & thesaurus, it's a bit geeky 1st time around but well documented if you google how:
you get the free colordict app from google play then use that to index additional dictionaries
https://play.google.com/store/apps/d...rdict&hl=en_GB
there is also an old MR thread here, but the mantano app has had 3 years to eveolve since this thread was created:
https://www.mobileread.com/forums/arc.../t-156749.html