Chore: simplify wording for person entities

- Replaced all instances of "Unnamed Member" with "Someone Unnamed"
- Removed unused UNNAMED_MEMBER constant
- Renamed UNNAMED_PERSON to THAT_UNNAMED_PERSON to match its value
- Renamed UNNAMED_USER to UNNAMED_PERSON and changed the value to "unnamed person"

src/components/MembersList.vue

@@ -177,7 +177,7 @@ import {
   NOTIFY_ADD_CONTACT_FIRST,
   NOTIFY_CONTINUE_WITHOUT_ADDING,
 } from "@/constants/notifications";
-import { UNNAMED_MEMBER } from "@/constants/entities";
+import { SOMEONE_UNNAMED } from "@/constants/entities";
 
 interface Member {
   admitted: boolean;
@@ -225,7 +225,7 @@ export default class MembersList extends Vue {
    * Get the unnamed member constant
    */
   get unnamedMember(): string {
-    return UNNAMED_MEMBER;
+    return SOMEONE_UNNAMED;
   }
 
   async created() {