- fixed an issue due of recent changes that made the application think that is run always for the first time; fixed not applying the selected language translation

- some more code is refactored in the Preferences
- the axis will now be drawn on the canvas as they were left in the previous run (just like the HUD and the Workspace)
- for processors with less than 4 cores now the default number of workers is 1 (changed from 2)
- some graphical settings go now directly to the defaults dictionary and will not pass through the `options` app dictionary

defaults.py

@@ -87,7 +87,7 @@ class FlatCAMDefaults:
         "global_log_verbose": 2,
         "global_portable": False,
 
-        "global_languages": ['English', 'Romanian'],
+        "global_languages": ['English'],
         "global_language_current": 'English',
 
         "global_systray_icon": True,
@@ -95,7 +95,7 @@ class FlatCAMDefaults:
         "global_project_at_startup": False,
         "global_version_check": True,
         "global_send_stats": True,
-        "global_worker_number": int((os.cpu_count()) / 2) if os.cpu_count() > 4 else 2,
+        "global_worker_number": int((os.cpu_count()) / 2) if os.cpu_count() > 4 else 1,
         "global_tolerance": 0.005,
 
         "global_save_compressed": True,