Translation welcome, default and page

Translation of files:
- welcome.md
- default.md
-page.md
Translation posts "Getting Started"

Translation of files:
- 01-01-01-Getting-Started.md
- 01-02-01-Use-the-Current-Stable-Version.md
- 01-03-01-Built-in-Web-Server.md
- 01-04-01-Mac-Setup.md
- 01-05-01-Windows-Setup.md
- 01-06-01-Vagrant.md
Translation post "Code Style Guide"

Translation of file:
- 02-01-01-Code-Style-Guide.md
Translation posts "Language Highlights"

Translation of files:
- 03-01-01-Language-Highlights.md
- 03-02-01-Programming-Paradigms.md
- 03-03-01-Namespaces.md
- 03-04-01-Standard-PHP-Library.md
- 03-05-01-Command-Line-Interface.md
- 03-06-01-XDebug.md
Translation posts "Dependency Management"

Translation of files:
- 04-01-01-Dependency-Management.md
- 04-02-01-Composer-and-Packagist.md
- 04-03-01-PEAR.md
Translation posts "Coding Practices"

Translation of files:
- 05-01-01-Coding-Practices.md
- 05-02-01-The-Basics.md
- 05-03-01-Date-and-Time.md
- 05-04-01-Design-Patterns.md
- 05-05-01-Exceptions.md