[TYPO3-core] FYI72: Fix bug #12675: Validation issues in sysext reports: Fix several errors

[Christian Kuhn]

The attached patch will be committed to SVN trunk in 72 hours if nobody
complaints.

Type: bugfix

Branches: trunk

Bugtracker references:
http://bugs.typo3.org/view.php?id=12675

Mission: The reports module doesn't validate

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.

Regards
Christian
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