Currently I am still using this plugin (I know, it is a plugin, not an app, but it works with 4.7.x).
"Friendly URL Translit By Ilya Hoilik https://ipshelp.ru" (the url is not working either it is for search purposes if you want to hunt for it)
Iirc it used to be a free plugin in the marketplace, it removes all non-standard chars from the url.
It keeps the emojis (and accented non-English characters, etc) in the topic title, but removes them from the URLs.
Imo it should be part of the core functionality for SEO.