- fixed Measuring Tool - after doing a measurement the Notebook was switching to Project Tab without letting the user see the results

- more work on the translation engine; the app now restarts after a language is applied
- added protection against using Travel Z parameter with negative or zero value (in Geometry).

ObjectCollection.py

@@ -14,6 +14,10 @@ from PyQt5 import QtGui, QtCore, QtWidgets
 from PyQt5.QtCore import Qt
 # import webbrowser
 
+import gettext
+import FlatCAMTranslation as fcTranslate
+fcTranslate.apply_language('ObjectCollection')
+
 
 class KeySensitiveListView(QtWidgets.QTreeView):
     """