[TYPO3-hci] complete translation of error messages

[Georg Ringer]

Hello,

Martin Kutschker:
> I want remind that translated (error) messages are part of a nice 
> accessible BE. Every time or so I stumble across English messages. IMHO 
> this is not acceptable as not everybody understands English.

this concerns also the translation of the Extension Manager > 
typo3/sysext/lang/locallang_csh_em.xml

Georg