[!!!][TASK] RTE: locallang inferno

The patch resolves quite some mess in ext:rtehtmlarea
around the localization files. Many files are moved around
and some are deleted (ok with localization team). Some
internal methods are adapted a bit.

Change-Id: I23bfd10cfc4920e4361c7df971251741e04d2f29
Resolves: #67811
Releases: master
Reviewed-on: http://review.typo3.org/40702


Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Benjamin Mack <benni@typo3.org>
Tested-by: Benjamin Mack <benni@typo3.org>