Improve german courses (#9755)

Author: relativvv

Diff for: README.md

@@ -209,7 +209,7 @@ Write, compile and run your code within a browser. Try it out!
 
 + [Chinese / 中文](more/free-programming-playgrounds-zh.md)
 + [English](more/free-programming-playgrounds.md)
-
++ [German](more/free-programming-playgrounds-de.md)
 
 ## Translations
 

Diff for: courses/free-courses-de.md

@@ -1,5 +1,7 @@
 ### Index
 
+* [Ansible](#ansible)
+* [Bash](#bash)
 * [C](#c)
 * [C++](#cpp)
 * [Haskell](#haskell)
@@ -11,9 +13,20 @@
 * [Python](#python)
 * [Rust](#rust)
 * [Spieleentwicklung](#spieleentwicklung)
+* [SQL](#sql)
 * [TypeScript](#typescript)
 
 
+### Ansible
+
+* [Ansible Tutorial](https://www.redhat.com/de/topics/automation/learning-ansible-tutorial) - RedHat
+
+
+### Bash
+
+* [Bash-Scripting Grundkurs](https://www.ernstlx.com/linux90script.html)
+
+
 ### <a id="cpp"></a>C++
 
 * [C++ Grundlagen Tutorials von Pilzschaf](https://www.youtube.com/playlist?list=PLStQc0GqppuVs05kWvLBoHcWCULX3ueIM) - Pilzschaf
@@ -77,6 +90,11 @@
 * [Unreal Engine 4 Tutorial Deutsch/German](https://www.youtube.com/playlist?list=PLNmsVeXQZj7olLCliQ05e6hvEOl6sbBgv) - The Morpheus Tutorials
 
 
+### SQL
+
+* [SQL-Grundlagen](https://wiki.selfhtml.org/wiki/Datenbank/SQL-Grundlagen) - SelfHTML
+
+
 ### TypeScript
 
 * [Erstellen von JavaScript-Anwendungen mithilfe von TypeScript](https://docs.microsoft.com/de-de/learn/paths/build-javascript-applications-typescript/) - Microsoft

Diff for: more/free-programming-playgrounds-de.md

@@ -0,0 +1,8 @@
+### Index
+
+* [SQL](#sql)
+
+
+### SQL
+
+* [SQL-Island](https://sql-island.informatik.uni-kl.de) - Spielerisch SQL lernen