The current example in https://www.mongodb.com/docs/mongoid/master/reference/fields/#localized-fields does not specify a field type, technically creating an Object (or untyped) field, but continues to treat the field as a string field, i.e. something like a message which is textual and can be translated to other languages.

A localized field can be of any type, for example it can have a numeric value which is monetary and different across locales.

The documentation should point out that localized fields can have any type specified.