[BUGFIX] Malformed special characters with PHP 5.3

Grid/RowViewHelper uses PHP function htmlentities() without an
encoding argument.
The default encoding of htmlentities() has changed from ISO-8815-1
in PHP 5.3 to UTF-8 in PHP 5.4.
Since TYPO3 uses UTF-8 as default character set for data handling,
we force UTF-8 in any htmlentites() call to gain compatibility
with PHP 5.3.

Resolves: #57538
Change-Id: I12b1195b5a2b0d0c6bc2a7249b70af67db99de5d
Merge "[BUGFIX] Malformed special characters with PHP 5.3"