[BUGFIX] default charset to utf-8

set the default charset to utf-8, since TYPO3 > 4.7 uses UTF-8
as default charset

Resolves: #63298
Releases: 4.0
Change-Id: Ib0cd2c96eac7c72c8a8f884d76863730f28827b3
Reviewed-on: http://review.typo3.org/34554
Reviewed-by: Ivan Dharma Kartolo <ivan.kartolo@gmail.com>
Tested-by: Ivan Dharma Kartolo <ivan.kartolo@gmail.com>