fix translation strings with multiple parameters


this fixes a lot of warnings given by msgmerge:

../PLCOpenEditor.py:196: warning: 'msgid' format string with unnamed arguments cannot be properly localized:
The translator cannot reorder the arguments.
Please consider using a format string with named arguments,

     1

<?xml version="1.0" encoding="UTF-8"?>

     2

<BaseParams Name="py_ext_0" IEC_Channel="0"/>