fix token acquisition

gradio_app.py

@@ -6,7 +6,12 @@ import os
 
 config_folder = 'fast_align_config'
 temp_folder = 'tmp'
-hf_token = os.getenv('HF_TOKEN')
+hf_token = os.environ.get('HF_TOKEN')
+
+if hf_token:
+    print("Read HF token")
+else:
+    print("HF token not found")
 
 translator = SalamandraTA7bTranslator(hf_token)