fix(34-05): add missing German translation keys to collection namespace

- Add form.msrp, form.purchasePrice, form.itemNamePlaceholder, form.optionalNotes
- Fixes key parity test failure in tests/i18n/locales.test.ts

src/client/locales/de/collection.json

@@ -20,7 +20,11 @@
 		"notes": "Notizen",
 		"notesPlaceholder": "Zusätzliche Notizen...",
 		"productLink": "Produktlink",
-		"urlPlaceholder": "https://..."
+		"urlPlaceholder": "https://...",
+		"msrp": "UVP",
+		"purchasePrice": "Kaufpreis",
+		"itemNamePlaceholder": "Gegenstandsname",
+		"optionalNotes": "Optionale Notizen..."
 	},
 	"classification": {
 		"ultralight": "Ultraleicht",