Word the denied-permission message for every host

- Drop "browser settings": Element Desktop grants microphone access through the
  app, not a browser.
- Mirror the no-device message, which names no app.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

locales/en/app.json

@@ -166,7 +166,7 @@
   "microphone_level": {
     "label": "Microphone level",
     "no_device": "No microphone found. Connect one, then try again.",
-    "permission_denied": "Element Call cannot use your microphone. Allow access in your browser settings.",
+    "permission_denied": "Microphone access is blocked. Allow it, then try again.",
     "value": "{{level}} of {{max}}"
   },
   "microphone_off": "Microphone off",

src/components/MicrophoneLevelMeter.stories.tsx

@@ -113,7 +113,7 @@ export const PermissionDenied: Story = {
     const canvas = within(canvasElement);
     await expect(canvas.queryByRole("meter")).toBeNull();
     await expect(
-      canvas.getByText(/Allow access in your browser settings/),
+      canvas.getByText(/Microphone access is blocked/),
     ).toBeVisible();
   },
 };

src/components/MicrophoneLevelMeter.test.tsx

@@ -27,7 +27,7 @@ describe("MicrophoneLevelMeter", () => {
     );
     // A next action, not a flat meter that reads as silence.
     expect(
-      denied.getByText(/Allow access in your browser settings/),
+      denied.getByText(/Microphone access is blocked/),
     ).toBeInTheDocument();
     expect(denied.queryByRole("meter")).toBeNull();