Fix minor issues about translated strings and coding style. Add comment relative to file function info in X1 gerber file format.

eeschema/plot_schematic_PS.cpp

@@ -129,9 +129,9 @@ void DIALOG_PLOT_SCHEMATIC::createPSFile( bool aPlotAll, bool aPlotFrameRef )
 
             m_MessagesBox->AppendText( msg );
         }
-        catch (IO_ERROR& e)
+        catch( IO_ERROR& e )
         {
-            msg.Printf( _( "PS Plotter Exception : '%s'"), wxString(e.errorText ) );
+            msg.Printf( wxT( "PS Plotter Exception : '%s'"), GetChars( e.errorText ) );
             m_MessagesBox->AppendText( msg );
         }