chore(i18n): sync en-US from Citadel @ fc1670b

Author: saki-yuzishima[bot]

locales/en-US.yml

@@ -1153,6 +1153,10 @@ settings.option.advanced.lyrics.lineStaggeringImmersive: Line Staggering (Immers
 settings.option.advanced.lyrics.lineStaggeringImmersive.description: More resource intensive.
 settings.option.advanced.lyrics.scaleOnAny: Allow Scaling Effect On Any Word
 settings.option.advanced.lyrics.scaleOnAny.description: Allows any word to be potentially scaled, not just the emphasized ones
+settings.option.advanced.lyrics.singEngine: Sing Engine
+settings.option.advanced.lyrics.singEngine.description: GPU renders the word-by-word Sing animation with the Web Animations API (smoother, much lower CPU). Legacy uses the original per-frame renderer.
+settings.option.advanced.lyrics.singEngine.legacy: Legacy
+settings.option.advanced.lyrics.singEngine.waapi: GPU (Web Animations)
 settings.option.advanced.lyrics.singLyricsEverywhere: Sing Lyrics Everywhere
 settings.option.advanced.lyrics.singLyricsEverywhere.description: Enable Sing lyrics outside of Immersive view. More resource intensive.
 settings.option.advanced.mavericksLcd: Mavericks LCD