"Did you mean ...?" optgroup for search criteria

[simongray]

When using string-based search criteria rather than searching for an entity, the select dropdown should have an optgroup with the heading "Did you mean..." for quick corrections. The items in this optgroup should be a shortlist of possible entity matches.

E.g. if "1500" is used as a criteria then 1500-tallet must appear under this opgroup.

Selecting the option then switches the item.