erp5_payroll_l10n_fr: DSN exports should be formated with iso-8859-1

bt5/erp5_payroll_l10n_fr/SkinTemplateItem/portal_skins/erp5_payroll_l10n_fr/DSNReport_printAsFile.py

-data = context.getTextContent().decode('utf-8').encode('iso-8859-1')
+import unicodedata
+
+data = unicodedata.normalize('NFKD', context.getTextContent().decode('utf-8')).encode('iso-8859-1', 'ignore')
 
 # Update sending mode "on the fly"
 dsn_line_list = data.split('\n')