Odd; when I look at the source code of the page’s content I see:
<div class="entry-content">
<p>?n s? l?nge ?r forumet p? plats
<a href ="https://muut.com/i/sampoesi">sampoesi forum</a>
<script src="//cdn.muut.com/1/moot.min.js"></script></p>
</div><!-- .entry-content -->
It looks like the muut embed code has been dropped directly into the page’s content (or is in the template file it uses) rather than by using the meta box; not sure if you used a developer who might have been confused about how to do it.
In any case, if you can figure out where that code is getting inserted into that page, if you replace the <script> tag in that code with <script type="text/javascript" src="//cdn.muut.com/latest/moot.se.min.js"></script>
it will include the Swedish Muut script and will be translated. ??
If you can’t figure out where that code is added, could you send me a screenshot of the post editor for that page so I can see the page content as well as the meta box settings?
Thanks! I hope that info solves your problem.