Reword the phrase about a clean directory

When the directory is clean, no tracked files are modified.
Merge pull request #319 from GArik/EN

Fix enumerated lists markdown 2
Translations for chapter 5

Translate "Mantaining a Project", "Working in topic branches", "Applying patches from e-mail", "Applying a patch with apply" sections.
refined several sentences, and fixed a translation error
Merge pull request #321 from nico87/it-chapter5

Translations for chapter 5
Merge pull request #322 from kelvinh/master

Refined several sentences, and fixed a translation error
[cs] Figure captions introduced by "Figure" instead of "Obrázek"

The translator notes moved to the separate file
cs/09-git-internals/02-translation-notes.markdown
Merge pull request #323 from pepr/master

[cs] Figure captions introduced by "Figure" instead of "Obrázek"
fixed a translation error
Merge pull request #324 from kelvinh/master

[zh_CN]Fixed a translation error
fixed a translation error
fixed a typo
Minor updates (Windows & typo)

Add information for Windows' system console usage.
Also fix incorrect curly double quotes in code.
Fix typos and spelling mistakes in chapter 1
Fix old spelling and typos in chapter 2
Change old spelling and fix typos in chapter 3
Fix typos and old spelling in chapter 4
Replace old spelling and fix typos in chapter 5
Fix misspellings and typos in chapter 6
Correctly escape the exclamation mark in command line

As mentioned in issue #46, you can not use "!gitk" in a
command line as the exclamation mark would be interpreted
by the shell instead of being passed to the command. To
disable shell interpretation, you must use single quotes.