Updating "Language" in PDF file "Advanced" property

I need to find a way to change "Reading Option" for "Language" in PDF document "Document Properties".
Under the "Security" tab in "Document Property" document restriction summary for "Changing the Document" and "Document Assmbly" are set to "Not Allowed" and I can't change it even I have all administrative rights.
I created thiS PDF file myself as a form first and after saved it as a PDF document.  When documet opened as a form "Form Property Language set as "English".

Setting language is one of the requiremnents for posting documet on our compnay website.
I'm not sure if I described this clearly, but I need someone's help ASAP

Who is Participating?
Will SzymkowskiSenior Solution ArchitectCommented:
tribuna33Author Commented:
That's what I'm trying to use, but this option is greyed out and I can not change "Language"
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