Merge "Remove unused volume strings." into udc-dev

  <string name="assistant_utterance">Assistant</string>

  <!-- String defining the label for the accessibility settings button -->

  <string name="a11y_settings_label">Accessibility Settings</string>

  <!-- String defining the label for the volume button -->

  <string name="volume_label">Volume</string>

  <!-- String defining utterance for the volume button for screen readers -->

  <string name="volume_utterance">Volume controls</string>

  <!-- String defining the label for the power button -->

  <string name="power_label">Power</string>

  <!-- String defining utterance for the power button for screen readers -->