pfSense/pfsense 85e0f98src/usr/local/www csrf_error.php guiconfig.inc

Create custom CSRF Error page. Implements #9799

* Use formatting consistent with other GUI pages
* Warns the user about potential dangers of submitting form data

(cherry picked from commit da7384c4a42adbcb7c20beba05ff460d0f6da7b3)
DeltaFile
+116-0src/usr/local/www/csrf_error.php
+6-0src/usr/local/www/guiconfig.inc
+122-02 files

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