Remove escaped double-quotes

For some reason, escaped double quotes in wxString::Format cause issues
on Mac.  We can replace them with single quotes in most places without
loss of clarity

pcbnew/python/scripting/pcbnew_action_plugins.cpp

@@ -80,7 +80,7 @@ PyObject* PYTHON_ACTION_PLUGIN::CallMethod( const char* aMethod, PyObject* aArgl
     }
     else
     {
-        wxString msg = wxString::Format( _( "Method \"%s\" not found, or not callable" ), aMethod );
+        wxString msg = wxString::Format( _( "Method '%s' not found, or not callable" ), aMethod );
         wxMessageBox( msg, _( "Unknown Method" ), wxICON_ERROR | wxOK );
     }