fix(settings): complete the external-artwork disclosure (#1141)

The disclosure named fanart.tv but omitted musicbrainz.org, which the
name-to-MBID identity lookup contacts with the artist/album name when an artist
has no tag MBID; it also mis-stated what is sent. Rewrite the note across all 9
locales: names both fanart.tv (artwork source) and musicbrainz.org (identity
lookup with the artist/album name), and is accurate about on-demand/read-only
and that library tags are never changed. Satisfies fanart.tv terms ("inform
your users") and design-review §9.

src/locales/en/settings.ts

@@ -273,8 +273,8 @@ export const settings = {
   nowPlayingEnabledDesc: 'Broadcast your currently playing track to the server\'s live listener view. Disable to stop sending playback data.',
   nowPlayingPluginNote: 'Required when using the official Navidrome Discord Rich Presence plugin.',
   externalArtwork: 'External Artwork Scraper',
-  externalArtworkDesc: 'Fetch high-resolution artist backgrounds from fanart.tv for the fullscreen player and artist pages. Off by default.',
-  externalArtworkNote: "Contacts fanart.tv, sending the artist's MusicBrainz id.",
+  externalArtworkDesc: 'Fetch high-resolution artist backgrounds and banners from fanart.tv for the fullscreen player and artist pages. Off by default.',
+  externalArtworkNote: 'When on, it sends the artist (and current album) name to musicbrainz.org to identify the artist, then fetches artwork from fanart.tv — on demand and read-only; your library tags are never changed. Artwork is provided by fanart.tv and its contributors.',
   externalArtworkByokTitle: 'Personal API key (BYOK)',
   externalArtworkByokDesc: 'Optional. Enter your own fanart.tv personal API key here — it is sent in addition to the app key.',
   externalArtworkByokSaved: 'Saved — sent with the app key while the scraper is on.',