TYPO3 Core

Problem: The reports module doesn't produce valid HTML

Solution:
- Fix a typo from "colspans" to "colspan"
- Add CDATA comment around a JS block
- htmlspecialchar a href
- Add required alt attribute to some images:
-- In typo3/sysext/reports/mod/index.php with a locallang value
-- In typo3/sysext/reports/reports/class.tx_reports_reports_status.php with empty value, the icons warning and error for sections are added as background-images at other places, so we don't need a usefull alt tag here.

(issue imported from #M12675)