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/plugins/scrobbler/services/lastfm.ts

@@ -132,10 +132,15 @@ export class LastFmScrobbler extends ScrobblerBase {
         ? songInfo.alternativeTitle
         : songInfo.title;
 
+    const artist =
+      config.alternativeArtist && songInfo.tags?.at(0) !== undefined
+        ? songInfo.tags?.at(0)
+        : songInfo.artist;
+
     const postData: LastFmSongData = {
       track: title,
       duration: songInfo.songDuration,
-      artist: songInfo.artist,
+      artist: artist,
       ...(songInfo.album ? { album: songInfo.album } : undefined), // Will be undefined if current song is a video
       api_key: config.scrobblers.lastfm.apiKey,
       sk: config.scrobblers.lastfm.sessionKey,

src/plugins/scrobbler/services/listenbrainz.ts

@@ -81,8 +81,13 @@ function createRequestBody(
       ? songInfo.alternativeTitle
       : songInfo.title;
 
+  const artist =
+    config.alternativeArtist && songInfo.tags?.at(0) !== undefined
+      ? songInfo.tags?.at(0)
+      : songInfo.artist;
+
   const trackMetadata = {
-    artist_name: songInfo.artist,
+    artist_name: artist,
     track_name: title,
     release_name: songInfo.album ?? undefined,
     additional_info: {