ES-MX locale not using the value of generic 'es' defined in the manifest.

[glr0221]

Even if the spam addin manifest defines values for the 'es' locale, they are not being used when outlook locale is set to ES-MX (Spanish-Mexico).

Your Environment

• Platform [PC desktop, Mac, iOS, Office on the web]: WEB/MAC (But probably all)
• Host [Excel, Word, PowerPoint, etc.]: Outlook
• Office version number: Possibly all
• Operating System: Possibly All
• Browser (if using Office on the web): Chrome (But probably all)

Expected behavior

If a spam addin manifest defines the 'es' locale, it should be used if 'es-mx' is not defined and the outlook locale is spanish-mexico.

Current behavior

Currently, if es-mx is not defined but 'es' locale values are defined, default locale is used (english).

Steps to reproduce

1. Install a spam addin manifest for outlook. Ensure that the manifest has a definition for the 'es' locale.
2. Set the outlook locale to 'spanish - mexico'.
3. Open the spam addin and it will be in english.

Link to live example(s)

NA

Provide additional details

It looks like this :

Context

Spanish-Mexico-locale using customers are currently asking for support on this item.

Useful logs

NA

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