How do I change language in ppt presentation for all content at once?

I have a ppt ppresentation I have translated from one language to another. I want to change language setting for all the content within the presentation so I can use an appropriate spellchecker.
Is there a way to do that for whole presentation at one step?
The only way I figured out so far is going through all the slides one after another, selecting textboxes and changing language for each of them.
Thanks for help.
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Below thread is almost an answer to your problem.
But it will be only worked for text frames in the current presentation
Good luck!

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