[ANSWERED] Language pack integration

Hello,
Regularly Henry offers a preview version of W10 and links language packs.
May he be thanked.
Despite my research I have not found how to integrate the language pack in the Iso or esd file before Winreducer process.
Does anyone has a link that could get me out of this frustration?
Thanks in advance.
((NDLR : translated from the native language by Google)

I do it with the Wintoolkit

caution: in which options remove the all hook(21), Screenshot 4

the left Plus switch and add packet

Thank you for :
- The adequacy of the response;
- The speed of reactivity

S'il vous plaît un message de réussite - Please a success message

Hello,

That's it !
With some difficulty, the integration is made.
However, the Windows installation is always in English.
Perhaps there he also has a chance to put that part in the language pack selected?
Who knows !

In fact, the installation made from ISO from (issu) Toolkit is performed in the added language.
However, once this is passed through ISO Winreducer 6.3.0 (without changing any of the basic parameters: drivers, keyboard, services, system ...), added language disappears from the installation to be replaced by the language original (en-us).
I do not get why.