Add support for RPX files in Italian language #136
Description
Goal
Make PyAcitgraphy understand RPX files which were exported in Italian language.
Current Behavior
Through the language argument RPX files in English, German, and French can be interpreted.
Expected Behavior
Set language='IT' and the file in Italian is correctly loaded.
Proposed Solution Approach
Extend the file multilang.py with the field and column names in Italian.