fix(discord-rpc, scrobbler): Align artist and title with the last.fm's de facto standard

- Display only the main artist.
- Display the title in its original language without romanization.

- fix #3358
- fix #3641

src/i18n/resources/en.json

@@ -758,6 +758,7 @@
           "token": "Enter ListenBrainz user token"
         },
         "scrobble-alternative-title": "Use alternative titles",
+        "scrobble-alternative-artist": "Use alternative artists",
         "scrobble-other-media": "Scrobble other media"
       },
       "name": "Scrobbler",