Plural label doesn't work with List (text) fields that have multiple items

Problem/Motivation

The plural label isn't rendering for List (text) type fields with multiple cardinality and multiple items. A quick check indicates that the items count for this kind of field is stored under a different array key than standard multiple cardinality text fields.

There could be other cases. I need to investigate further.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes