Added total donation amount to donation overview

ref #133

src/locales/de.json

@@ -433,5 +433,6 @@
   "you-have-to-save-your-changes-to-generate-a-link": "Du musst deine Änderungen speichern, um einen Link zu generieren.",
   "you-must-create-at-least-one-card-or-cancel": "Du musst mindestens eine Blankokarte erstellen (oder abbrechen).",
   "zip-postal-code": "Postleitzahl",
-  "total-paid-amount": "Gezahlter Gesamtbetrag"
+  "total-paid-amount": "Gezahlter Gesamtbetrag",
+  "paid-amount": "Gezahlter Betrag"
 }

src/locales/en.json

@@ -433,5 +433,6 @@
   "you-have-to-save-your-changes-to-generate-a-link": "You have to save your changes to generate a link.",
   "you-must-create-at-least-one-card-or-cancel": "You must create at least one card (or cancel).",
   "zip-postal-code": "ZIP/ postal code",
-  "total-paid-amount": "Total paid amount"
+  "total-paid-amount": "Total paid amount",
+  "paid-amount": "Paid amount"
 }