update messaging for unknown icons on home feed

src/components/ActivityListItem.vue

@@ -270,7 +270,7 @@ export default class ActivityListItem extends Vue {
       {
         group: "alert",
         type: "warning",
-        title: "Hidden Person",
+        title: "Person Outside Your Network",
         text: "This person is not visible to you.",
       },
       3000
@@ -282,8 +282,8 @@ export default class ActivityListItem extends Vue {
       {
         group: "alert",
         type: "warning",
-        title: "Unknown Person",
+        title: "Unidentified Person",
-        text: "This person is not known.",
+        text: "Nobody specific was recognized.",
       },
       3000
     );