The norwegian word for "Today" is more correctly written as "I dag", not "Idag".
Also, on mouseovering repeating tasks, the "every day" or "every Sunday" is not translated.
Thank you for the report, I have let the translators know about it and it should be fixed soon.
To confirm, this is with the web version, a browser extension or?
This is with the web version, yes. Firefox on Windows.