Added **all** missing toast translations

ref #133

src/components/donations/AddDonationModal.svelte

@@ -59,7 +59,7 @@ import { is_promise } from "svelte/internal";
       let amount_cent = Math.floor(amount_input * 100);
       processed_last_submit = false;
       const toast = Toastify({
-        text: "adding donation",
+        text: $_('adding-donation'),
         duration: -1,
       }).showToast();
       if (is_fixed) {
@@ -79,7 +79,7 @@ import { is_promise } from "svelte/internal";
             modal_open = false;
             //
             Toastify({
-              text: "donation_added",
+              text: $_('donation_added'),
               duration: 500,
               backgroundColor: "linear-gradient(to right, #00b09b, #96c93d)",
             }).showToast();
@@ -108,7 +108,7 @@ import { is_promise } from "svelte/internal";
             modal_open = false;
             //
             Toastify({
-              text: "donation_added",
+              text: $_('donation_added'),
               duration: 500,
               backgroundColor: "linear-gradient(to right, #00b09b, #96c93d)",
             }).showToast();