During Overwatch maintenance, the banner shown in Battle.net contains improper English grammar/spelling. This has persisted for at least the entire time Overwatch 2 has been out.
The message “We are currently conducting a live maintenance on Overwatch, which should take a few minutes. During this time, you may need to restart your game client” is improper.
It should read “We are currently conducting live maintenance on Overwatch…” instead. The phrase “a live maintenance” is poor English and should be corrected.