Completed and corrected Dutch translation

A. General Composure: completed the translations
B. website behavior: translated everything
D. Server behavior: completed the translations and corrected some grammer mistakes
E. general gameplay: corrected some grammer mistakes and completed the translation
F. Client Modifications: corrected some mistakes
I. Consequences: translated the title and some text + corrected a grammer mistake
Meningloze is plural (meervoud) so foto needs to be plural as well. (afbeeldingen sounds better in my opinion)