mmm...
setting the language in the text style should be enough (on top of installing the required "dictionaries", of course!).
... using the style editor, is not necessary (nor useful) for hyphenating the text.
anyway, i thought that this topic is rather a simple one, and tried to get a small manual put together and summarize some of the knowledge about languages in scribus:
- scribus-manual-language.epub.zip (zipped .epub from this forum)
- Scribus and Languages (https://github.com/aoloe/scribus-manual-language/releases/download/v0.1/scribus-manual-language.epub) (.epub from github)
- Scribus and Languages (https://github.com/aoloe/scribus-manual-language/r) (readable source markdown files on github)
it's a draft, but should already contain a few good advices.
you can contribute to it by commenting in this thread or by adding tickets and pull request to
https://github.com/aoloe/scribus-manual-language/
on top of it, i have lot of started manuels that finally deserve to be put in a state that can be published, at least as a draft.
soon, i plan to to upload an incomplete draft of a more general introduction to scribus, with some more information on how other people can start contributing to it.