feat: Dynamically add all languages to db

Add unit test to find missing translations

tests/Unit/database/seeders/SettingsSeederTest.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Tests\Unit\database\seeders;
+
+use Database\Seeders\SettingsSeeder;
+use Tests\TestCase;
+
+class SettingsSeederTest extends TestCase
+{
+    /**
+     * All language keys are defined in all languages based on the en language file.
+     *
+     * @return void
+     */
+    public function testReturnsAJSONMapWithSameAmountOfItemsAsLanguageDirectoriesPresent()
+    {
+        $languageDirectories = array_filter(glob(resource_path().'/lang/*'), 'is_dir');
+
+        $languageMap = json_decode(SettingsSeeder::getSupportedLanguageMap(), true);
+
+        $this->assertTrue(count($languageMap) === count($languageDirectories));
+    }
+}