Spanish translation for Web UI not working in Mac OS with Chrome or Firefox

Translation files messages-es-ES.json created in View Designer are ignored running Chrome or Firefox in Mac OS

Steps to reproduce:

• Create a new Document type called "Customer Request" in Studio. Could be created in Folders and Domains
• Create a translations file called messages.json in View Designer

     {
        "label.document.type.customerrequest":"Customer Request"
     }
  

• Create a translations file for spanish called messages-es-ES.json

     {
        "label.document.type.customerrequest":"Petición de cliente"
     }
  

Try to create a new document of type "Customer Request" in your Nuxeo instance in a Folder or a Domain (running Chrome or Firefox wit Spanish as default language)

The label is not translated

NOTE:

• New labels has been created for a new document type called "Customer request".
• es-ES is a language included in the supported language list published in https://support.crowdin.com/api/language-codes/
• Chome on Mac returns "es" as navigator.language
• Firefox on Mac returns "es" or "es-es" as navigator.language. You can choose on Firefox settings