Child improvements

- Make the tree view editable in child_translated_values_view.xml
- Make "get infos" button retreive basic info or if project doesn't exists, create it and retreive basic info 
- Add French, German and Italian descriptions in project_compassion_view.xml
- Add French, German and Italian country names in country_compassion.py
- Make project_compassion_view.xml (the view) as clear as possible
- Create English child description (child_description_en.py)
- Create Italian child description (child_description_it.py)
- Refactor child_descriptions_en|de|it.py 
you can replace 31 and 32 by

activities_string = cls._gen_list_string(activities, ', ', ' und ') + '.'

Or better yet you could change _gen_list_string definition to
def _gen_list_string(cls, list, separator, last_separator, termination='')

And use it to pass the final '.'