Rename plugins to libs and update all file references

libs/vendor/illuminate/contracts/Translation/HasLocalePreference.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Illuminate\Contracts\Translation;
+
+interface HasLocalePreference
+{
+    /**
+     * Get the preferred locale of the entity.
+     *
+     * @return string|null
+     */
+    public function preferredLocale();
+}