Chore: convert "unnamed" into constant

- "Unnamed/Unknown" simplified into just "Unnamed"
- Phrase variations have their own constants

src/components/MembersList.vue

@@ -81,7 +81,7 @@
         <div class="flex items-center justify-between">
           <div class="flex items-center">
             <h3 class="text-lg font-medium">
-              {{ member.name || "Unnamed Member" }}
+              {{ member.name || unnamedMember }}
             </h3>
             <div
               v-if="!getContactFor(member.did) && member.did !== activeDid"
@@ -177,6 +177,7 @@ import {
   NOTIFY_ADD_CONTACT_FIRST,
   NOTIFY_CONTINUE_WITHOUT_ADDING,
 } from "@/constants/notifications";
+import { UNNAMED_MEMBER } from "@/constants/entities";
 
 interface Member {
   admitted: boolean;
@@ -220,6 +221,13 @@ export default class MembersList extends Vue {
   apiServer = "";
   contacts: Array<Contact> = [];
 
+  /**
+   * Get the unnamed member constant
+   */
+  get unnamedMember(): string {
+    return UNNAMED_MEMBER;
+  }
+
   async created() {
     this.notify = createNotifyHelpers(this.$notify);