To change the language to other than Swedish in SkyMap Portal, follow these steps:
When logging into SkyMap Portal, click on the field where it says Swedish.
Choose a language in the field and then log in as usual.
Note that this is a beta feature where SkyMap does not guarantee that all functionality will work as expected in languages other than Swedish. For English and German languages, a more controlled translation is used in the SkyView and File Manager modules.