[nl] Retranslate chapter 03

Reshuffle wording and sentences. Replace some Babelfish type translations
with more sensible translations. Introduce diacritics to enhance clarity.
Update command line output in Chapter 2

The command line output in the examples is from an older version of Git
(1.7.*) and is slightly inconsistent with the latest version.
Merge pull request #646 from Cpt-xx/chapter03

[nl] Retranslate chapter 03
Merge pull request #645 from Matt-Stevens/update-commandline-output-ch2

Update command line output in Chapter 2