Updater: change download completed string

    <string name="downloading_notification">Downloading</string>

    <string name="download_paused_notification">Download paused</string>

    <string name="download_paused_error_notification">Download error</string>

    <string name="download_completed_notification">Download completed</string>

    <string name="download_completed_notification">Update is ready to be installed</string>

    <string name="download_starting_notification">Starting download</string>

    <string name="update_failed_notification">Update failed</string>

    <string name="installation_suspended_notification">Installation suspended</string>