- fix app crash for the case that there are no translation files

- fixed some forgotten strings to be prepared for internationalization in ToolCalculators
- fixed Tools menu no longer working due of changes
- added some test translation for the ToolCalculators (in Romanian)
- fixed bug in ToolCutOut where for each tool invocation the signals were reconnected

FlatCAMGUI.py

@@ -21,8 +21,11 @@ from FlatCAMEditor import FCShapeTool
 
 import gettext
 import FlatCAMTranslation as fcTranslate
-fcTranslate.apply_language('FlatCAMGUI')
 
+fcTranslate.apply_language('FlatCAMGUI')
+import builtins
+if '_' not in builtins.__dict__:
+    _ = gettext.gettext
 
 class FlatCAMGUI(QtWidgets.QMainWindow):
     # Emitted when persistent window geometry needs to be retained