' . __( 'Only use this screen once you have updated to a new version of WordPress through Updates/Available Updates (via the Network Administration navigation menu or the Toolbar). Clicking the Upgrade Network button will step through each site in the network, five at a time, and make sure any database updates are applied.' ) . '
' . __( 'If a version update to core has not happened, clicking this button won’t affect anything.' ) . '
' . __( 'If this process fails for any reason, users logging in to their sites will force the same update.' ) . '
' . __( 'For more information:' ) . '
' . __( 'Documentation on Upgrade Network' ) . '
' . __( 'Support' ) . '
' . __( 'All done!' ) . '