You will be prompted to select ContentPacks. Select the WinPE ones
Now kick back and let it process. This will take a considerable amount of time to process. It is normal to receive warnings for ADK Language files if you don't have the Language Neutral Package installed. Review the logs for more information
You can now move this OSBuild into your Production OSDBuilder Home and use this as an OSImport. OSBuilds created from this image should be much quicker to process since you don't have to do a full MultiLang
Final Steps
Keep in mind you will still need to set the proper Language information in a New-OSBuildTask, including the SourcesLanguageCopy. The SourcesLanguageCopy should be added to ContentPacks shortly