[CLEANUP] Correct case for SimpleXMLElement

Use the correct case 'SimpleXMLElement' instead of 'SimpleXmlElement'
when loading locallang.xml and remove backslashes for options.

Resolves: #67242
Related: #67234
Releases: master
Change-Id: Ia1234b7887396e1b848e6e74f0453ad5c8035e0c
Reviewed-on: http://review.typo3.org/39896


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>