Readme: improve wording on preview variants

closes #1016

Author: cagix

readme.md

@@ -2,6 +2,9 @@
 title: "IFM 2.1: Programmieren 2 (Sommer 2025)"
 has_license: true
 no_beamer: true
+attachments:
+  - link: "https://github.com/Programmiermethoden-CampusMinden/Prog2-Lecture/blob/_pdf/readme.pdf"
+    name: "PDF-Version"
 ---
 
 <!--  pandoc -s -f markdown -t markdown+smart-grid_tables-multiline_tables-simple_tables --columns=94 --reference-links=true  readme.md  -o xxx.md  -->
@@ -21,11 +24,12 @@ no_beamer: true
 ---
 
 ::: tip
-**Read Online**:
+**Vorschau**
 
-*   [GitHub Preview](https://github.com/Programmiermethoden-CampusMinden/Prog2-Lecture/blob/_gfm/readme.md)
-*   [Docsify Preview](https://docsify-this.net/?basePath=https://raw.githubusercontent.com/Programmiermethoden-CampusMinden/Prog2-Lecture/refs/heads/_docsify&homepage=readme.md&sidebar=true&browser-tab-title=PR2&font-size=14px&searchbox=true&externalLinkTarget=_blank&mergeNavbar=true&zoom-images=true&dark-mode=auto#/)
-*   [PDF-Version](https://github.com/Programmiermethoden-CampusMinden/Prog2-Lecture/blob/_pdf/readme.pdf)
+Sie können die Vorlesungsunterlagen in zwei Varianten anschauen:
+
+*   [Markdown in GitHub](https://github.com/Programmiermethoden-CampusMinden/Prog2-Lecture/blob/_gfm/readme.md)
+*   [Docsify (experimentell)](https://docsify-this.net/?basePath=https://raw.githubusercontent.com/Programmiermethoden-CampusMinden/Prog2-Lecture/refs/heads/_docsify&homepage=readme.md&sidebar=true&browser-tab-title=PR2&font-size=14px&searchbox=true&externalLinkTarget=_blank&mergeNavbar=true&zoom-images=true&dark-mode=auto#/)
 :::
 
 ---