I have Ubuntu 16.10 with abiword (3.0) installed. It seems to have a global default spell check language of UK English (keeps trying to correct "behavior" to "behaviour"). How do I switch this to US English? None of the info for this on the abiword website seems applicable.
This worked for me: Open a new document, change the language in the spell check to the preferred one: Tools -> set language
Save this document as a template called "normal.awt" in /home/yourname /.config/abiword/templates/ thereafter every new document will open in your preferred language.
Greetings from Sweden