search-popover: Search other types description
Currently we search only the mime-type string, because it was more convenient for programming. But it's obviously inconvenient for users, because the string shown in the list (i.e. the localized description) doesn't match the strings being searched. This becomes worse when the language is not English.
Use a more advanced expression to search both the mime type string as well as its localized description.
This fixes #2659 (closed)