Fix missing localization for Admin.Catalog.Products.Pictures.Fields.IsDefault

[Copilot]

The "Is default" checkbox in the Picture details popup renders the raw resource key Admin.Catalog.Products.Pictures.Fields.IsDefault instead of a human-readable label, as visible in the screenshot above.

Root Cause

ProductPictureModel.IsDefault is decorated with [GrandResourceDisplayName("Admin.Catalog.Products.Pictures.Fields.IsDefault")] in both Grand.Web.AdminShared and Grand.Web.Vendor models, but this key was never registered in any localization resource file.

Change

• src/Web/Grand.Web/App_Data/Resources/Upgrade/en_220.xml — adds the missing entry:

<Resource Name="Admin.Catalog.Products.Pictures.Fields.IsDefault" Area="Admin">
    <Value>Is default</Value>
</Resource>

[Copilot]

Pull request overview

This PR fixes a missing English localization entry so the “Is default” checkbox label for product pictures renders as a human-readable string instead of the raw resource key (Admin.Catalog.Products.Pictures.Fields.IsDefault) in the admin (and any other UI surfaces using that key).

Changes:

• Added the missing Admin.Catalog.Products.Pictures.Fields.IsDefault translation resource to the 2.2 upgrade English resource file (en_220.xml).

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