Fix a regression in flip iop legacy params handling

Previously it was not always needed, but it might be
in history stack as "orientation (off)", but now we
always want it by default, so enable it.
If user want's, he can disable it.
Updated Dutch translation
Merge pull request #625 from MRIG/master

Updated Dutch translation
Fix (r2) a regression in flip iop legacy params handling

If flip iop is disabled, enable it,
and replace params with default_params.
Update French translation.