i18n: migrate all German text to English

Enforce the repo convention that committed text is English.
Translates ABOUTME headers, code comments, log/error messages,
shell prompts, and documentation across all files.
CLAUDE.md files remain in German per policy.

defaults/bin/moonarch-waybar-hidpp

@@ -1,6 +1,6 @@
 #!/usr/bin/bash
-# ABOUTME: Waybar-Modul das den Batteriestatus eines HID++ Geräts als JSON ausgibt.
-# ABOUTME: Findet den richtigen hidpp_battery_* Eintrag dynamisch per MODEL_NAME (Argument).
+# ABOUTME: Waybar module that outputs HID++ device battery status as JSON.
+# ABOUTME: Finds the correct hidpp_battery_* entry dynamically by MODEL_NAME (argument).
 
 if [ -z "$1" ]; then
     echo "Usage: moonarch-waybar-hidpp <model_name>" >&2
@@ -45,4 +45,4 @@ for dev in /sys/class/power_supply/hidpp_battery_*; do
     fi
 done
 
-# Gerät nicht gefunden — keine Ausgabe, Waybar versteckt das Modul
+# Device not found — no output, Waybar hides the module