Language pack?

WordPress Localization. There’s already a Swedish translation you can try.

Thank you! But how do I install the translation?

Install sv_SE.mo to wp-includes/languages. Create the languages directory if it doesn’t already exist.
After that, set WPLANG in wp-config.php to sv_SE.

It depends on the theme you’re using, tobbger. The popular Kubrick theme for example is hard coded and it won’t be enough to just install another language file. In addition, some language files are incomplete and you have to update them by yourself.

Yes, I’m using the Kubrick-theme. I’ll test rboren’s tip, just to check if it works anyway.

Using another language file will result in a translated administration GUI and some translated words and sentences in the Kubrick them. The rest must be done manually.

I just translated the Kubrick theme to Swedish. Available here: https://henrik.nyh.se/dump/kubrick.sv_SE.ISO-8859-1.rar

As to the non-theme localization, I’m using https://svn.automattic.com/wordpress-i18n/sv_SE/trunk/messages/