Added dutch to language.h
Fixed some messages where the text shown on the screen was more than 17 characters
Fixed small typo that would prevent compiling
Revert "Fixed small typo that would prevent compiling"

This reverts commit 51ae4881ab0fea7f82fcf6d8266a5b53cd17e007.
Merge pull request #782 from marcovannoord/Marlin_v1

Added dutch to language.h