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/PathSimulatorGui.py

@@ -539,7 +539,7 @@ class PathSimulation:
 class CommandPathSimulate:
 
     def GetResources(self):
-        return {'Pixmap': 'Path-Simulator',
+        return {'Pixmap': 'Path_Simulator',
                 'MenuText': QtCore.QT_TRANSLATE_NOOP("Path_Simulator", "CAM Simulator"),
                 'Accel': "P, M",
                 'ToolTip': QtCore.QT_TRANSLATE_NOOP("Path_Simulator", "Simulate Path G-Code on stock")}