Hi Partner,
Please refer to following steps to remove localized content.
1. Open DeployToDynamics365Instance.ps1, comment all lines which contain keyword "json" besides 1033.json.(English)

2. Set the property which controls display of language dropdown list to false.
3. Delete all json related web files and their attachments.


However, I still recommend that you only disable the property of configuration file, which will leave extensibility for future and avoid potential issue.
Furthermore, size of total localization files is lower than 1MB.
Regards,
Clofly