feat: add note about campfire mode (#44118)

* feat: add note about campfire mode

* chore: shorter :)

Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>

Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>

client/i18n/locales/english/translations.json

@@ -99,6 +99,7 @@
     "private-name": "Your name will not appear on your certifications, if this is set to private.",
     "claim-legacy": "Once you've earned the following freeCodeCamp certifications, you'll be able to claim the {{cert}}:",
     "for": "Account Settings for {{username}}",
+    "sound-mode": "This adds the pleasant sound of acoustic guitar throughout the website. You'll get musical feedback as you type in the editor, complete challenges, claim certifications, and more.",
     "username": {
       "contains invalid characters": "Username \"{{username}}\" contains invalid characters",
       "is too short": "Username \"{{username}}\" is too short",

client/src/components/settings/sound.tsx

@@ -19,6 +19,7 @@ export default function SoundSettings({
     <Form inline={true} onSubmit={(e: React.FormEvent) => e.preventDefault()}>
       <ToggleSetting
         action={t('settings.labels.sound-mode')}
+        explain={t('settings.sound-mode')}
         flag={sound}
         flagName='sound'
         offLabel={t('buttons.off')}