feat(DonationsOverview): i18n loading text

src/locales/de.json

@@ -183,6 +183,7 @@
     "donation-updated": "Sponsoring wurde aktualisiert",
     "donation_added": "Sponsoring hinzugefügt",
     "donations": "Sponsorings",
+    "donations-are-being-loaded": "Sponsorings werden geladen...",
     "donor": "Sponsor:in",
     "donor-added": "Sponsor:in hinzugefügt",
     "donor-deleted": "Sponsor:in gelöscht",

src/locales/en.json

@@ -183,6 +183,7 @@
     "donation-updated": "Donation updated",
     "donation_added": "Donation_added",
     "donations": "Donations",
+    "donations-are-being-loaded": "donations are being loaded",
     "donor": "Donor",
     "donor-added": "Donor added",
     "donor-deleted": "donor deleted",