Localization: "Create Locale" is enabled on an empty Add Custom Locale form and produces a Locale asset with no name and no identifier

Steps to reproduce:

1. Create a new project
2. Install the Localization package (com.unity.localization)
3. Open Edit > Project Settings > Localization and click "Create" to make the settings asset
4. Click "Add Custom Locale"
5. Without typing anything in either field, click "Create Locale"
6. Note the filename offered in the save dialog, save it, and inspect the resulting asset

Actual results: "Create Locale" is enabled on an empty form. Clicking it opens a save dialog pre-filled with " ().asset" and produces a Locale asset with an empty name and an empty identifier. The asset is added to the project in that state

Expected results: "Create Locale" stays disabled until a name and a valid identifier have been entered

Reproducible with versions: 1.5.12 (6000.5.7f1, 6000.6.0f1, 6000.7.0a6)

Tested on (OS): MacBook Pro - Tahoe 26.6.2

Notes:

• The button does become disabled if the identifier field is typed into and then cleared, so validation exists but is not applied to the initial empty state.
• The resulting asset carries no name and no identifier, so it cannot be told apart in the Project window or in Available Locales.