[BUGFIX] Fatal error in PageRenderer

When calling page.inlineLanguageLabel in TypoScript,
it results with a fatal error in the frontend because
in PageRenderer there is no check of the TYPO3 mode.

Resolves: #70681
Releases: master
Change-Id: I3b2e9bf28bcfce799fb3b90fa404d6b6986ce464
Reviewed-on: http://review.typo3.org/44048


Reviewed-by: Marcus Schwemer <ms@schwemer.de>
Tested-by: Marcus Schwemer <ms@schwemer.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>