Give the Add/Delete buttons on the AI Datasets, Models and Classes
option tabs the same treatment as the console: an add_circle icon on
the add button and a delete (trash) icon on the delete button, each
with a labelled text span.
Add the missing AddNewClass/AddNewDataset/AddNewModel language strings
so the add buttons read "Add New Class/Dataset/Model" instead of the
raw translation keys.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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