- finished adding in Paint Tool the usage of an external object to set the extent of th area painted. For simple shapes (single Polygon) the shape can be anything, for the rest will be a convex hull of the reference object

- modified NCC tool so for simple objects (single Polygon) the external object used as reference can have any shape, for the other types of objects the copper cleared area will be the convex hull of the reference object
- modified the strings of the app wherever they contained the char seq <b> </b> so it is not included in the translated string

FlatCAMApp.py

@@ -4027,7 +4027,7 @@ class App(QtCore.QObject):
         msgbox = QtWidgets.QMessageBox()
         msgbox.setWindowTitle(_("Toggle Units"))
         msgbox.setWindowIcon(QtGui.QIcon('share/toggle_units32.png'))
-        msgbox.setText(_("<B>Change project units ...</B>"))
+        msgbox.setText("<B>%s</B>" % _("Change project units ..."))
         msgbox.setInformativeText(_("Changing the units of the project causes all geometrical "
                                     "properties of all objects to be scaled accordingly.\nContinue?"))
         bt_ok = msgbox.addButton(_('Ok'), QtWidgets.QMessageBox.AcceptRole)
@@ -5007,7 +5007,7 @@ class App(QtCore.QObject):
                 msgbox = QtWidgets.QMessageBox()
                 msgbox.setWindowTitle(_("Delete objects"))
                 msgbox.setWindowIcon(QtGui.QIcon('share/deleteshape32.png'))
-                # msgbox.setText(_("<B>Delete FlatCAM objects ...</B>"))
+                # msgbox.setText("<B>%s</B>" % _("Change project units ..."))
                 msgbox.setText(_("Are you sure you want to permanently delete\n"
                                  "the selected objects?"))
                 bt_ok = msgbox.addButton(_('Ok'), QtWidgets.QMessageBox.AcceptRole)