Hi @Sabeloga, my apologies: until today there were some issues related to the deployment of Wikistats that prevented the release of new languages. I haven't had the bandwidth to deal with those until today but I'm happy to confirm that the latest deploy is out and you should be able to see Swedish in the language list.

Thank you so much for flagging this and for your translation contributions.

Hi again, there seems to have been some errors when the translations were carried over. Some text that is translated on Translatewiki doesn't appear translated on site (like Wikimedia:Wikistats-metrics-unique-devices-tooltip), the button that reads Last two years (Wikimedia:Wikistats-time range-2-year) and its associated units uses English capiltalision despite the translation unit not doing so and some text don't seem to be translatable at all (like the window that reads Select a time period for this metric:).
Could you look into this?

@Sabeloga this is really valuable feedback! I've opened two tasks with the bugs you've mentioned. They are two super simple issues, but it's better to track them separately from the original query to keep archives happy.

https://phabricator.wikimedia.org/T287910
https://phabricator.wikimedia.org/T287908

Closing this now, please feel free to open more tasks if you see more issues with locales. Unfortunately it's only a very small number of us dedicating significant time to Wikistats in general and internationalization in particular, so these requests are really useful.