feat: Improve translations, fade inactive collection members

app/models/User.ts

@@ -1,4 +1,6 @@
+import { subMinutes } from "date-fns";
 import { computed, observable } from "mobx";
+import { now } from "mobx-utils";
 import type { Role } from "@shared/types";
 import ParanoidModel from "./ParanoidModel";
 import Field from "./decorators/Field";
@@ -39,6 +41,17 @@ class User extends ParanoidModel {
     return !this.lastActiveAt;
   }
 
+  /**
+   * Whether the user has been recently active. Recently is currently defined
+   * as within the last 5 minutes.
+   *
+   * @returns true if the user has been active recently
+   */
+  @computed
+  get isRecentlyActive(): boolean {
+    return new Date(this.lastActiveAt) > subMinutes(now(10000), 5);
+  }
+
   @computed
   get role(): Role {
     if (this.isAdmin) {