Show menu label instead of menu machine name in widget

Problem/Motivation

When adding the field widget provided by this module, the menu machine names are shown in the top level dropdown.

Steps to reproduce

Proposed resolution

In the widget, load the menu's and use the menu labels as values instead of the menu machine names.

Remaining tasks

User interface changes

Top level dropdown from widget contains menu labels instead of menu machine names.

API changes

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Data model changes

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