Refactor some APIs

src/Extend/AdminClient.php

@@ -0,0 +1,34 @@
+<?php namespace Flarum\Extend;
+
+use Illuminate\Contracts\Container\Container;
+use Flarum\Admin\Actions\IndexAction;
+
+class AdminClient implements ExtenderInterface
+{
+    protected $assets = [];
+
+    protected $translations = [];
+
+    public function assets($assets)
+    {
+        $this->assets = array_merge($this->assets, $assets);
+
+        return $this;
+    }
+
+    public function translations($keys)
+    {
+        $this->translations = array_merge($this->translations, $keys);
+
+        return $this;
+    }
+
+    public function extend(Container $container)
+    {
+        $container->make('events')->listen('Flarum\Admin\Events\RenderView', function ($event) {
+            $event->assets->addFiles($this->assets);
+        });
+
+        IndexAction::$translations = array_merge(IndexAction::$translations, $this->translations);
+    }
+}