add json compatibility for upload file , change app main name , add persian languange compatibility

libs/ktem/ktem/app.py

@@ -39,7 +39,7 @@ class BaseApp:
 
     def __init__(self):
         self.dev_mode = getattr(settings, "KH_MODE", "") == "dev"
-        self.app_name = getattr(settings, "KH_APP_NAME", "Kotaemon")
+        self.app_name = getattr(settings, "KH_APP_NAME", "DatallChat")
         self.app_version = getattr(settings, "KH_APP_VERSION", "")
         self.f_user_management = getattr(settings, "KH_FEATURE_USER_MANAGEMENT", False)
         self._theme = KotaemonTheme()

libs/ktem/ktem/utils/lang.py

@@ -1,5 +1,6 @@
 SUPPORTED_LANGUAGE_MAP = {
     "en": "English",
+    "fa": "Persian",
     "ja": "Japanese",
     "vi": "Vietnamese",
     "es": "Spanish",