Yes, I agree with you. It just seemed that you didnāt know how ę was related to pattern.
Actually the book itself tells you that the meaning of ę is āwritten languageā so that is probably what it should be changed to. ę as a single character canāt be found in the books glossary but in one of the āLearn and write basic Chinese charactersā-lessons.
From the book
Hey everybody,
Iām sorry my answer is late. I just moved to a new town and still donāt have any wifi, so getting online is a little bit tricky 
Anyways, thank you so much for your inputs! I changed the translation of ę to the meanings you suggested und replaced the commas. Itās great to have people who are so engaged here 
If you have any other suggestions, Iāll be happy to hear them.
Happy learning,
donnerwoelkchen
Thanks a lot for your continuous improvements!