Will there be an option to change the language used for spellchecking?

If you’re on a Mac, spellchecking is controlled by the system, and should use the correct language for you. 🤞

For Linux and Windows, I’ll see about adding a language selection.

Update: Spellcheck language selection was added in v0.21: https://billiam.itch.io/deepdwn/devlog/237732/v0210-fonts-and-languages

OMG!  YOU'RE MY HERO!