As I know there is not available tool to do like that. Could have tool to translate whole page into anther language https://docs.developers.optimizely.com/content-management-system/docs/optimizely-languages .

But I do not see any available thing like translating only from specific property to property between existed content languages like that.

I suggest that you can make a tool by your own to do your business such as loading all pages of that page type and update this property value in Spanish by that property value in English if it is empty

Hi Calen,

One way you could approach this would be to implement a fallback mechanism so that, if there's no Spanish version of a given property value, it will use the English version. You could modify your model so your property looks like this:

[Display(
    Name = "My URL",
    GroupName = SystemTabNames.Content,
    Order = 500)]
[CultureSpecific]
public virtual Url MyUrl {
    get
    {
        var url = this.GetPropertyValue(p => p.MyUrl);

        //If a value has been set, or we're on the master language branch, return the value
        if (IsMasterLanguageBranch || url is not null)
        {
            return url;
        }

        //Get the value from the master language
        return this.GetFallbackValue<Url>("MyUrl");
    }
    set => this.SetPropertyValue(p => p.MyUrl, value);
}

Where the GetFallbackValue extension method looks like this:

public static class LanguageFallbackExtensions
{
    public static T GetFallbackValue<T>(this IContent content, string propertyName)
    {
        var contentLoader = ServiceLocator.Current.GetInstance<IContentLoader>();
        var masterContent = contentLoader.Get<IContent>(content.ContentLink.ToReferenceWithoutVersion(), (content as ILocalizable).MasterLanguage);
        return masterContent.TryGetPropertyValue<T>(propertyName);
    }
}

This won't modify the content in the CMS but should allow you to make the property editable in Spanish without breaking anything if it's not localised.