✨(backend) the LanguagePicker now uses config as options

- config endpoint languages are used as available options for LanguagePicker
- updating the language from it, triggers an update on the user via API

src/backend/impress/settings.py

@@ -221,7 +221,9 @@ class Base(Configuration):
 
     # Languages
     LANGUAGE_CODE = values.Value("en-us")
-    LANGUAGE_COOKIE_NAME = "docs_language"  # cookie & language is set from frontend
+    # cookie & language is set from frontend
+    LANGUAGE_COOKIE_NAME = "docs_language"
+    LANGUAGE_COOKIE_PATH = "/"
 
     DRF_NESTED_MULTIPART_PARSER = {
         # output of parser is converted to querydict
@@ -233,9 +235,9 @@ class Base(Configuration):
     # fallback/default languages throughout the app.
     LANGUAGES = values.SingleNestedTupleValue(
         (
-            ("en-us", _("English")),
-            ("fr-fr", _("French")),
-            ("de-de", _("German")),
+            ("en-us", "English"),
+            ("fr-fr", "Français"),
+            ("de-de", "Deutsch"),
         )
     )