feat: add audio compressor feature to website (Card 7, FAQ Q7/A7) across all 13 locales

website/locales/en.json

@@ -46,6 +46,8 @@
   "FEATURE_5_DESC": "Our official servers are free and fast, but you can take full ownership if you want to. Launch your own private relay server in seconds via Docker.",
   "FEATURE_6_TITLE": "Instant Invites / 1-Click Join",
   "FEATURE_6_DESC": "No IP addresses or passwords to exchange. Share a generated invite link with your friends to let them join your room automatically with a single click.",
+  "FEATURE_7_TITLE": "Volume Leveling / Audio Compressor",
+  "FEATURE_7_DESC": "No more riding the volume knob. Built-in audio compressor boosts quiet dialogue and tames loud explosions. Works on Netflix, Prime Video, Disney+, YouTube, and any HTML5 video. Completely local — no audio data leaves your computer.",
   "COMP_TITLE": "KoalaSync vs. Teleparty",
   "COMP_SUBTITLE": "See why open source, ad-free and privacy-first is the superior way to watch together.",
   "COMP_COL_FEATURE": "Feature",
@@ -118,6 +120,8 @@
   "FAQ_A5": "Yes, each participant needs KoalaSync installed — but there's no sign-up or account creation. Simply click the invitation link, install the extension if you haven't already, and you'll join the room automatically in seconds.",
   "FAQ_Q6": "Is my data safe? What if I don't trust the official server?",
   "FAQ_A6": "Completely safe. KoalaSync's relay server is RAM-only — all session data is permanently deleted the moment you leave the room. No database, no logging, no analytics, no accounts. And if you prefer full control: you can self-host your own private relay server via Docker in minutes. The entire codebase is open source and auditable on GitHub.",
+  "FAQ_Q7": "Can I fix quiet dialogue and loud explosions when watching videos in the browser?",
+  "FAQ_A7": "Yes. KoalaSync 2.2.0 includes a built-in audio compressor that reduces the gap between quiet and loud parts of your video. It runs locally via the Web Audio API — no audio data ever leaves your computer. Open the popup, create a room, go to Settings → Audio Processing, toggle the compressor on, and pick a preset. Works on Netflix, Prime Video, Disney+, YouTube, and any HTML5 video site.",
   "HOWTO_TITLE": "How to synchronize videos with friends using KoalaSync",
   "HOWTO_DESC": "Watch any video in perfect sync with friends across YouTube, Netflix, Twitch and more. No sign-up, no tracking.",
   "HOWTO_STEP_1_NAME": "Install the browser extension",