Fix comments in example .gitignore file

The gitignore man page states that the lines starting with '#' are
ignored, but the sharp characters inside a line do not start a comment.
They are part of the regex. The comments must be seperated on their own line.
[de] Update english original text
[de] Improve german translation of chapter "Git Configruation" (7.1)

- Use german Umlauts instead of two letters (ue => ü, oe = ö, ...)
- Fix typo
- Use "Du", "Deinen",... instead of "du", "deinen"... See also
  http://www.duden.de/sprachwissen/sprachratgeber/gross-oder-kleinschreibung-von--em-du-du--em--und--em-ihr-ihr--em--1
  Use capitalized letters because in first parts of the book they are
  also used.
- Improve translation of several sentences.
- Comment out english orginal text with <!-- and -->. Insert a whitespace
  between two hyphens because two hyphens end the comment in html.
Merge pull request #393 from fernsehkind/master

[de] Improve german translation of chapter "Git Configruation" (7.1)
Merge pull request #392 from progit/fix_gitignore

Fix comments in example .gitignore file
[de] Remove comment for Figure 7-1 because it is shown on git-scm.com
Translated subchapter 7.1 in italian
Merge pull request #395 from dghilardi/translation-it-chapter-7

Translated subchapter 7.1 in italian
Merge pull request #394 from fernsehkind/master

[de] Remove comment for Figure 7-1 because it is shown on git-scm.com