Fix german text in english translation in theme-switcher

packages/theme-switcher/src/i18n/en/translation.json

 {
-    "color-mode": "Farbmodus ändern",
+    "color-mode": "Change color mode",
     "demo-title": "Theme Switcher Demo",
     "intro": "With the theme-switcher you can switch between multiple themes."
 }