lang: unit tests in django/await first loading of dict

frontend/tests.py

@@ -1,3 +1,24 @@
-from django.test import TestCase
+import json
+from os import listdir
+
+from django.test import Client, TestCase
+from django.contrib.staticfiles import finders
 
 # Create your tests here.
+
+class DictionnariesTest(TestCase):
+    def setUp(self) -> None:
+        self.client = Client();
+        self.directory = finders.find('js/lang/');
+
+    def test_lang(self):
+        keys = None
+
+        json_files = listdir(self.directory);
+        for file in json_files:
+            with open(f'{self.directory}/{file}') as f:
+                data: dict = json.load(f);
+                if (keys is None):
+                    keys = set(data.keys());
+                else:
+                    self.assertEqual(set(data.keys()), keys);