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/Gui/ViewProviderPath.cpp

@@ -717,7 +717,7 @@ void ViewProviderPath::recomputeBoundingBox()
 
 QIcon ViewProviderPath::getIcon() const
 {
-    return Gui::BitmapFactory().pixmap("Path-Toolpath");
+    return Gui::BitmapFactory().pixmap("Path_Toolpath");
 }
 
 // Python object -----------------------------------------------------------------------