Update README_de.md

Author: huhuhang

README_de.md

@@ -12,9 +12,9 @@ Matplotlib ist eine umfassende Python-Bibliothek zur Erstellung von statischen,
 
 |   Index | Name                                                                                                            | Schwierigkeit   | Repo                                                                       | Übung                                                                             |
 |---------|-----------------------------------------------------------------------------------------------------------------|-----------------|----------------------------------------------------------------------------|-----------------------------------------------------------------------------------|
-|       1 | [Schnellstart mit Matplotlib](https://labex.io/de/courses/quick-start-with-matplotlib)                          | ★☆☆             | [🔗 Repo](https://github.com/labex-labs/quick-start-with-matplotlib)       | [🚀 Labor Starten](https://labex.io/de/courses/quick-start-with-matplotlib)       |
-|       2 | [Matplotlib Übungslabs](https://labex.io/de/courses/matplotlib-practice-labs)                                   | ★☆☆             | [🔗 Repo](https://github.com/labex-labs/matplotlib-practice-labs)          | [🚀 Labor Starten](https://labex.io/de/courses/matplotlib-practice-labs)          |
-|       3 | [Grundlagen der Datenvisualisierung mit Seaborn](https://labex.io/de/courses/seaborn-data-visualization-basics) | ★☆☆             | [🔗 Repo](https://github.com/labex-labs/seaborn-data-visualization-basics) | [🚀 Labor Starten](https://labex.io/de/courses/seaborn-data-visualization-basics) |
+|       1 | [Schnellstart mit Matplotlib](https://labex.io/de/courses/quick-start-with-matplotlib)                          | Anfänger        | [🔗 Repo](https://github.com/labex-labs/quick-start-with-matplotlib)       | [🚀 Labor Starten](https://labex.io/de/courses/quick-start-with-matplotlib)       |
+|       2 | [Matplotlib Übungslabs](https://labex.io/de/courses/matplotlib-practice-labs)                                   | Anfänger        | [🔗 Repo](https://github.com/labex-labs/matplotlib-practice-labs)          | [🚀 Labor Starten](https://labex.io/de/courses/matplotlib-practice-labs)          |
+|       3 | [Grundlagen der Datenvisualisierung mit Seaborn](https://labex.io/de/courses/seaborn-data-visualization-basics) | Anfänger        | [🔗 Repo](https://github.com/labex-labs/seaborn-data-visualization-basics) | [🚀 Labor Starten](https://labex.io/de/courses/seaborn-data-visualization-basics) |
 
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