Threema-Android-mirror/app/src/main/res/values/qrscanner_strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="msg_default_status">Place a QR code inside the viewfinder rectangle to scan it.</string>
    <string name="msg_camera_framework_bug">Unable to access Android camera. Make sure permission to access the camera has been granted or restart your device.</string>
</resources>