Misspelling uppercase insert -> Insert image 3-8

Cause the misspelling the website do not show the figure in the html tag but only print [..]insert 18333fig0308.png [..]
Merge pull request #871 from byteriot/patch-1

Misspelling uppercase insert -> Insert image 3-8
[it] Improved sentence readability
[it] Added tab space - Fixed ''
Update 'git log' completion output
[de] Entfernt die Anmerkung von gitosis im Abschnitt zu gitolite

Gitosis wird im Abschnitt zu gitolite erwähnt, ohne das dies relevant wäre. Dies behebt #508 und geht auf den Fix in #870 ein.
[de] Includes homebrew as an alternative to install git.

Fügt die in Issue #868 angemerkte Möglichkeit der Installation über Homebrew zur deutschen Übersetzung hinzu.
[pt-br] fix mispelling concerto -> conserto
[it] Sentence improved

Miglioramento della frase introduttiva sotto consiglio di @daftano in seguito ad un breve scambio di commenti
Add a test on badly formated insert directive

The directive for inserting an image is:

 Insert <image>
Mention packed-refs.
fix typo in 01-chapter2
Merge pull request #874 from brennon/master

Update 'git log' completion output
Merge pull request #876 from TobsCore/master

[de] Includes Homebrew and removes gitosis mention in gitolite section
Merge pull request #877 from denisazevedo/master

[pt-br] fix mispelling concerto -> conserto
Merge pull request #878 from cirosantilli/packed-refs

Mention packed-refs.
Merge pull request #872 from byteriot/correzioni-ortografiche

[it] Text improved
Merge pull request #879 from fnumatic/patch-1

fix typo in 01-chapter2
Merge pull request #1 from progit/master

update