Move to Symfony Flex

The structure changed completely.
Bundles are gone. Everything is flatten in the folder `src`.
I separated import & api controllers to avoid _pollution_ in the main controller folder.

tests/Entity/EntryTest.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Tests\Entity;
+
+use App\Entity\Entry;
+use App\Tests\WallabagCoreTestCase;
+
+class EntryTest extends WallabagCoreTestCase
+{
+    public function testGetLanguage()
+    {
+        $this->logInAs('admin');
+        $entry = new Entry($this->getLoggedInUser());
+        $languages = [
+            'en_GB' => 'en-GB',
+            'en_US' => 'en-US',
+            'en-gb' => 'en-GB',
+            'en-US' => 'en-US',
+            'fr' => 'fr',
+            'fr_FR' => 'fr-FR',
+            'ja' => 'ja',
+        ];
+        foreach ($languages as $entryLang => $lang) {
+            $entry->setLanguage($entryLang);
+            $this->assertSame($lang, $entry->getHTMLLanguage());
+        }
+    }
+}