A notification is shown if ringtone is muted, but media isn't and media would be played over local speakers.
App strings and the app store description can be translated via Crowdin: https://crowdin.com/project/mutereminder
Translations have to be approved before being merged into the app. To become a translator with approval rights or to request a new language, please poke me on Crowdin or open an issue here on GitHub.
- Feature graphic by https://unsplash.com/@mbaumi