Change label localization
Change label localization

In the new format, label/localizedLabel/alternateLabel are distributed
differently.

  * `label` is the label found in the source, verbatim

  * `localizedLabel` should be an object with a single property and
    value. The property should be the language code for the label, and
    the value should be the label itself (repeated)

  * `alternateLabel` is any other labels derived from the verbatim text,
    whether in English or not. This is an object whose keys are language
    codes with values of an array of strings representing the period in
    that language.

periodo/periodo-data,periodo/periodo-data