[BUGFIX] RTE Language extension refers to non-existent method

RTE Language extension refers to non-existent method
tx_staticinfotables_div::getCurrentLanguage in Static Info Tables.

Releases: master, 6.2
Resolves: #62111
Change-Id: I9a37a40da367f47da9ee3a015537e79d3ff5a88a
Reviewed-on: http://review.typo3.org/33210
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Stanislas Rolland <typo3@sjbr.ca>
Tested-by: Stanislas Rolland <typo3@sjbr.ca>