[FIX] export: Excel data should be in raw format to be handle correctly
Launchpad automatic translations update.
[FIX] default is False, style format is different than DEFAULT_SERVER_DATE{TIME}_FORMAT, datetime is instance of date
[IMP] remove useless import
[FIX] export: Excel data should be in raw format to be handle correctly.

Require server revision 5159 adding attribute raw_data in __export_row method.