After installing locale files for your Language you can use all "language critical" functions in your python scripts (converters, renderers, plugins, etc.)
All you need is to run locale_files.sh script, then you have to set proper language locale argument in the setlocale()function in some python files as you can see below:
For example, you can see my small modification of the ClockToText.py converter which enables to display date/time string according to user language localization.