[TASK] Update copyright year to 2014

This patch updates the named constant TYPO3_copyright_year and
updates the second year number to the current year: 1998-2014.

Resolves: #55747
Releases: 6.2
Change-Id: If3b9d9b25b6ec6a7d2c8a0327dc7b330f0f09f8c
Reviewed-on: https://review.typo3.org/27392
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind