feat(queue): show ReplayGain metadata in current-track tech strip

Display track gain, album gain, and peak from file tags next to format,
bitrate, and sample rate so missing ReplayGain tags are obvious.

Refs: https://github.com/Psychotoxical/psysonic/issues/195

src/locales/en.ts

@@ -852,6 +852,9 @@ export const enTranslation = {
     trackPlural: 'tracks',
     showRemaining: 'Show remaining time',
     showTotal: 'Show total time',
+    rgTrack: 'T {{db}} dB',
+    rgAlbum: 'A {{db}} dB',
+    rgPeak: 'Peak {{pk}}',
   },
   statistics: {
     title: 'Statistics',