I updated the localized messages for AdvancedSearch a few days ago, but the user interface still has some messages in other languages.
Note the messages "Ålmenn hjelp" (Swedish) and "Hugs vala for framtidige søk" (Nynorsk) from w:no:Specia:Search. These are "MediaWiki:Advancedsearch-namespaces-preset-general-help" and "MediaWiki:Advancedsearch-namespaces-remember" according to page loaded with language set to qqx. Inspecting they are locally "Generell hjelp" and "Husk valgene for fremtidige søk", that is they are updated. They are although not used in the user interface.