If we still need these l10n files in the Settings app, I’d prefer to:
* concat and move `ringtone-names` + `notification-names` to `shared/locales/ringtones.en-US.properties` (and create the `shared/locales/ringtones.ini` file)
* modify the `locales.ini` files accordingly in the Ringtones and Settings app

If we don’t need these l10n files in the Settings app any more:
* let’s remove these files from the Settings app
* is there any reason for not concatenating them into a single `ringtones.en-US.properties` file?

Note that while we’re at it, we could remove the trailing spaces in the notification names.