shopping: UI strings all English

Picker dialog, hamburger menu entry, phone page and help section
still had German labels from the original request ("Einkaufsliste",
"keine aktive Liste", etc.). The rest of the app's UI is English,
so align everything here: menu entry is "Shopping list", dialog +
phone page copy translated, help references match. Trigger tags
stay as-is — both #einkauf and #shopping keep working so users with
either convention aren't disrupted.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

electron/package.json

@@ -1,6 +1,6 @@
 {
   "name": "hyprcrd",
-  "version": "1.9.19",
+  "version": "1.9.20",
   "description": "hyprcrd — self-hosted card manager",
   "main": "main.js",
   "scripts": {