Interpolate the default output's name rather than concatenating it

The menu built the label for a default output by joining a translated
"Default" to the device name, which leaves a translator no say over word
order, spacing or the brackets.

It now interpolates a string of its own. Not `default_named`, whose
markup styles the parenthetical for the settings dialog: a menu item's
label is plain text.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

locales/en/app.json

@@ -227,6 +227,7 @@
       "change_device_button": "Change audio device",
       "default": "Default",
       "default_named": "Default <2>({{name}})</2>",
+      "default_named_plain": "Default ({{name}})",
       "handset": "Handset",
       "loudspeaker": "Loudspeaker",
       "microphone": "Microphone",

src/components/MediaMuteAndSwitchButton.tsx

@@ -374,7 +374,7 @@ function SpeakerSection({
       case "default":
         return label.name === null
           ? t("settings.devices.default")
-          : `${t("settings.devices.default")} (${label.name})`;
+          : t("settings.devices.default_named_plain", { name: label.name });
     }
   };
   const icon = (