Evolution: 3.36.4-0ubuntu1


I started a few month ago using Evolution and like it a lot but it seems that Evolution does not have a user dictionary.
As I am using a Japanese keyboard, there are no German Umlauts and instead I am using the alternative way ae, oe, ue, and the sz I write simply as ss.
In my old Thunderbird I added all words with above-mentioned character combination in the user dictionary and after a while almost all words were added.
In Evolution I don't find such a possibility.

Questions:
1. How can a user dictionary be created and filled with words?
2. Where are the installed dictionaries located? 3. What experience was made modifying a dictionary?

Thanks in advance for helping replies