Fix EZP-21977: Fixed output binary file size display

The units suffixes are configurable and can be changed with: ezpublish.twig.extension.filesize.suffixes .
The bytes factor is 1000 instead of 1024 to be more usual for users.
The internationalization here is mostly used only to choose between point and coma pattern.
Fix EZP-21977 Moved ez_is_field_empty data provider test
the data provider of ez_is_field_empty was not at the right place and that was giving us problems with the tests of our issue.
ezp-21977 test a finir
unit test again & again
will be rebased in a sec