Support translated field copy

Problem/Motivation

For sites that have multiple languages enabled, the fields are essentially stored multiple times in the database (i.e. "en", "es", "fr", etc.). Expand the current functionality for Bulk Copy Fields to handle the use case where these translated field values (per selected entities) should be copied as well.

Proposed resolution

Expand the BulkCopyFields class to support copying not only the fields ("en" -- or site default), but all other translated versions of the fields.

Remaining tasks

Work with module maintainers to determine scope/effort.
Create patch to get the translated field values copied as well.

User interface changes

N/A

API changes

N/A

Data model changes

N/A