[TASK] Remove redundant system extensions

Change-Id: Iaa8a985932ae68f0bd61f2cfcf6968c4725b9e17

Conflicts:
	typo3/sysext/context_help/4.5/locallang_csh_ttcontent.xlf
	typo3/sysext/context_help/locallang_csh_pages.xlf
	typo3/sysext/context_help/locallang_csh_pageslol.xlf
	typo3/sysext/context_help/locallang_csh_ttcontent.xlf