[it] misspelling temo -> tempo

 allo stesso temo -> allo stesso tempo
[it] Fixed various misspelling
[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
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