Update 01-Installation.md

Add space **so wie in diesem Handbuch beschrieben** konfiguriert

https://contao.org/de/manual/3.0/installation.html#fehlersuche
Added prepareFormData hook
Update Cronjobs-in-Contao.md

fixed some typos
Update Eigene-Inserttags.md

fixed some typos
Update Hooks-in-Contao.md

fixed some typos
Update 07-Customizing-Contao.md

fixed some typos
Update 05-System-administration.md

fixed some typos
Update 02-Administration-area.md

fixed some typos
Conflicts:
	manual/de/02-Administration-area.md
Update 01-Installation.md

fixed some typos
Update 03-Managing-pages.md

fixed some typos
Conflicts:
	manual/de/03-Managing-pages.md
Update 04-Managing-content.md

fixed some typos
Conflicts:
	manual/de/04-Managing-content.md
Update 04-Managing-content.md

fixed some typos
Update 06-Data-Container-Arrays.md

fixed some typos
Conflicts:
	manual/de/06-Data-Container-Arrays.md
Merge branch '2.11' into 3.0
Update Cronjobs-in-Contao.md

fixed some typos
Conflicts:
	cookbook/de/Cronjobs-in-Contao.md
Update Eigene-Inserttags.md

fixed some typos
Update 08-Extension-Repository.md

fixed some typos
Update 03-Managing-pages.md

fixed some typos
Update 04-Managing-content.md

fixed some typos
Conflicts:
	manual/de/04-Managing-content.md
Update 04-Managing-content.md

fixed some typos