Hello. I also had a problem with localization. I resolved it in the following simple way:
To localize Open Office Portable you simply need to download from openoffice.org your native language version. Install it, it's better if you select custom installation to exclude integration to explorer and OS and quick start. Than rename OpenOfficePortable\App\openoffice\ folder to openoffice_eng, for example, and copy c:\program files\open office 3\ to OpenOfficePortable\App\openoffice\. Than copy the contents of openoffice_eng to openoffice, better using any filemanager. and when program asks you - do you want to overwrite? - answer - skip all. that's all, now you have localized openoffice working on any machine.
this method rather like method described on https://portableapps.com/apps/office/openoffice_portable/localization, but backuping fonts it's not enough to get this working.
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Open Office 3 Localization