Tidy up "widgets" XHTML

Add CDATA sections to scripts
Add ALT to image tags and close image tags
DIV tag cannot be inside a STRONG tag, so swap them around
SCRIPT cannot be part of TR tag, so place the SCRIPT inside a TD tag but
hide it.
Update gateways.widget.php

spelling mistake!
Merge remote-tracking branch 'origin/RELENG_2_2' into RELENG_2_2
Merge branch 'RELENG_2_2' of https://github.com/ExolonDX/pfsense into RELENG_2_2