refactor: adjust logging and localizations

- adjust logging strings
- update French and Dutch localizations
- add minimal .env file loader in Localizations.py

.env.example

@@ -9,3 +9,4 @@ AUTOGGUF_RESIZE_FACTOR=1.1
 AUTOGGUF_SERVER=enabled
 AUTOGGUF_SERVER_PORT=7001
 AUTOGGUF_SERVER_API_KEY=
+AUTOGGUF_LANGUAGE=en-US

src/AutoGGUF.py

@@ -1060,6 +1060,12 @@ def save_task_preset(self, task_item) -> None:
                 break
 
     def quantize_to_fp8_dynamic(self, model_dir: str, output_dir: str) -> None:
+        if model_dir or output_dir == "":
+            show_error(
+                self.logger,
+                f"{ERROR_STARTING_AUTOFP8_QUANTIZATION}: {NO_MODEL_SELECTED}",
+            )
+            return
         self.logger.info(
             QUANTIZING_TO_WITH_AUTOFP8.format(os.path.basename(model_dir), output_dir)
         )