I haven't done this myself, but I would suggest creating one or more styles for the Swedish text and setting the language for that style to Swedish. If you have whole paragraphs in Swedish you would only need a paragraph style. If you have individual words within paragraphs, you would need a character style (see screen grab).
Hope this helps.
[IMG]file:///C:/Users/Steve/AppData/Local/Temp/moz-screenshot.png[/IMG]
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