nl.po: Minor translation fix

"Cutlijst" is a profanity when pronounced in Dutch.
Limit the context option removing all services from a specific source

As suggested by Dima73
http://openpli.org/forums/topic/34533-shortcuts-in-channel-selection-menu/page-2
Merge branch 'master' of git://git.code.sf.net/p/openpli/enigma2