Gadgetbridge/app/src/main/res/drawable/ic_message_outline.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:tint="#7E7E7E"
    android:viewportWidth="24"
    android:viewportHeight="24">
  <path
      android:fillColor="#FFFFFF"
      android:pathData="M20,2H4C2.9,2 2,2.9 2,4V22L6,18H20C21.1,18 22,17.1 22,16V4C22,2.9 21.1,2 20,2M20,16H5.2L4,17.2V4H20V16Z"/>
</vector>