One addition with regard to PDF-XChange Viewer's OCR function:

The OCR functionality supports a base language set of English, French, German and Spanish. Additional language extension packages are available here.

I once had a client using it on Swedish texts, which is one of the optional languages available.  The language extension packages are also free.
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Brian - Windows 10 Pro, 64-Bit, Version 2004, Build 19041  

If you think that you can think about a thing, inextricably attached to something else, without thinking of the thing it is attached to, then you have a legal mind.

        ~ Thomas Reed Powell