change wording from "identity" to "identifier" in many places

src/views/ContactsView.vue

@@ -344,7 +344,7 @@ export default class ContactsView extends Vue {
 
     if (!identity) {
       throw new Error(
-        "Attempted to load Give records with no identity available.",
+        "Attempted to load Give records with no identifier available.",
       );
     }
     return identity;
@@ -962,7 +962,7 @@ export default class ContactsView extends Vue {
           group: "alert",
           type: "danger",
           title: "Status Error",
-          text: "No identity is available.",
+          text: "No identifier is available.",
         },
         -1,
       );