What does localizedMsg mean in the Salesforce Sync Change message

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What does localizedMsg mean in the Salesforce Sync Change message

We had some string fields implemented as picklists in several forms. When we added a new value in SFDC so that what we were collecting would match SFDC I got the message below. What does localizedMsg mean?

Error details:
The following fields have been changed:

• Primary_Service__c

• picklist entries changed

• localizedMsg

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