In LO52rc, but also on master 5.3 alpha, the Classification toolbar allows for insertion of fields and watermarks onto a document, but these fields are neither localized, nor do they appear to be modifiable.

Example :

Open new Writer document.
Activate the Classification toolbar.
Under the Intellectual Property dropdown menu, choose Confidential. A field is inserted in the header of the document indicating that the document is Confidential, and a message displayed that the document is confidential, and a watermark called "Confidential".

On my French language version of LO, all of these fields remain in English. There appears to be no way to edit the content. Double clicking on the field in the header takes me to an Edit Field dialog, but the fields are not editable.