Casting a close vote from Android app 1.0.26 brings up the confirmation "Flag submitted":
I checked on the site that I indeed cast a close vote on that question, not a flag.
Although close votes are internally handled as a type of flag, from user's perspective a vote and a flag are different things. This notification made me wonder if I fat-fingered an option, or if the app converted my vote to a flag, etc.
I think the notification should say "Vote submitted" when it confirms a vote.