Improve a network error description

    <!-- android.net.http Error strings --> <skip />

    <!-- Displayed when a web request was successful. -->

    <string name="httpErrorOk">OK</string>

    <!-- Displayed when a web request failed because we don't know the exact reason. -->

    <string name="httpError">The Web page contains an error.</string>

    <!-- Displayed when a web request failed with a generic network error. -->

    <string name="httpError">A network error occurred.</string>

    <!-- Displayed when a web request failed because the URL could not be found. -->

    <string name="httpErrorLookup">The URL could not be found.</string>

    <!-- Displayed when a web request failed because the site's authentication scheme is not supported by us. -->