[en] Chapter 06 Correct quotes and make suggestions for adjustments
[nl] Chapter 06 - Review and retranslate
Merge pull request #683 from Cpt-xx/chapter06

Chapter06 - Both NL and EN modifications
[nl] Chapter 07 - Reword and retranslate
Merge pull request #684 from Cpt-xx/chapter07

[nl] Chapter 07 - Reword and retranslate