[5.0] "print screen" when translated to "Impr écran"

I get a python error on the client side when I try to use the "print screen" report using the French locale.
Printing other reports with UTF8 characters does work, but not "Impr écran".
If I change my preferences to the English locale, then print screen works.

The error message is :
Traceback (most recent call last):
  File "/home/ls/Projets/OpenERP/v5.0/client/bin/modules/gui/main.py", line 1287, in _sig_child_call
    res = wid.handlers[button_name]()
  File "/home/ls/Projets/OpenERP/v5.0/client/bin/modules/gui/window/form.py", line 384, in sig_print
    self.sig_action('client_print_multi', adds={_('Print Screen'): {'report_name':'printscreen.list', 'name':_('Print Screen'), 'type':'ir.actions.report.xml'}})
  File "/home/ls/Projets/OpenERP/v5.0/client/bin/modules/gui/window/form.py", line 370, in sig_action
    res = obj.exec_keyword(keyword, {'model':self.screen.resource, 'id': id or False, 'ids':ids, 'report_type': report_type}, adds, self.screen.context)
  File "/home/ls/Projets/OpenERP/v5.0/client/bin/modules/action/main.py", line 185, in exec_keyword
    res = common.selection(_('Select your action'), keyact)
  File "/home/ls/Projets/OpenERP/v5.0/client/bin/common/common.py", line 117, in selection
    res = (res, values[res.decode('utf8')])
KeyError: u'Impr \xe9cran'