Implements #150

Adds an entry inside moderation section that allows moderators to check
pending tasks and mark them as solved.

app/controllers/moderation/administrator_tasks_controller.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+class Moderation::AdministratorTasksController < Moderation::BaseController
+  helper_method :administrator_task
+
+  def index
+    authorize! :index, AdministratorTask
+    @administrator_tasks = AdministratorTask.pending
+  end
+
+  def edit
+    authorize! :edit, administrator_task
+  end
+
+  def update
+    authorize! :update, administrator_task
+
+    administrator_task.update(user: current_user, executed_at: Time.now)
+    redirect_to moderation_administrator_tasks_path, { flash: { notice: t('.success') } }
+  end
+
+  private
+
+  def administrator_task
+    @administrator_task ||= AdministratorTask.find(params[:id])
+  end
+end