Path: Change filenames in the rest of the Path code

Reflects changes in 
* PathOpGui.SetupOperation()
* GetResources()
* sPIxmap
* pixmap
* *.UI files

Also contains minor translation context renames (these were edits made near to original intent of this commit)

src/Mod/Path/PathScripts/PathStop.py

@@ -82,7 +82,7 @@ class _ViewProviderStop:
         return None
 
     def getIcon(self):  # optional
-        return ":/icons/Path-Stop.svg"
+        return ":/icons/Path_Stop.svg"
 
     def onChanged(self, vobj, prop):  # optional
         # pylint: disable=unused-argument
@@ -101,7 +101,7 @@ class _ViewProviderStop:
 class CommandPathStop:
 
     def GetResources(self):
-        return {'Pixmap': 'Path-Stop',
+        return {'Pixmap': 'Path_Stop',
                 'MenuText': QtCore.QT_TRANSLATE_NOOP("Path_Stop", "Stop"),
                 'ToolTip': QtCore.QT_TRANSLATE_NOOP("Path_Stop", "Add Optional or Mandatory Stop to the program")}