disable multi-language support

If I have an installer supporting multi-language support and I have to deactivate the multi-language support, meaning the installer should be English only for now is enough if I do:
- comment out all the other lines like

!insertmacro MUI_LANGUAGE "French"

except the English one
- remove from .onInit the following line:

!insertmacro MUI_LANGDLL_DISPLAY

?

Or by removing only the above ones, the installer will actually use by default French if it "sees" a French system?

Thx,
Viv