Sitecore CMS - Changes to the original Language Fallback module source for allowing fallback of layout deltas on a Shared layout fields - http://trac.sitecore.net/LanguageFallback/browser/Trunk/Sitecore.SharedSource.PartialLanguageFallback/Managers/Fallba

FallbackLanguageManager.cs

        public static string ReadFallbackValue(Field field, Item item)
        {
            var fallbackItem = item.GetFallbackItem( MasterLanguage);
 
            // makes 3 step renderings, currentitem -> fallback -> standard value
            if (!TemplateManager.IsTemplate(item) && field.ID == Sitecore.FieldIDs.LayoutField && fallbackItem != null && fallbackItem.Versions.Count > 0 )
            {
                Field field1 = fallbackItem.Fields[field.ID];
                if (!field1.ContainsStandardValue)
                {
                    if (string.IsNullOrEmpty(field1.GetStandardValue()))
                    {
                        return field1.Value;
                    }
 
                    return XmlDeltas.ApplyDelta(field1.GetStandardValue(), field1.Value);
                }
            }
 
            //return fallbackItem != null && fallbackItem.Versions.Count > 0 ? fallbackItem[field.ID] : null;
 
            string fallbackValue = null;
 
            if (fallbackItem != null && fallbackItem.Versions.Count > 0)
            {
                // There is a fallback item, lets get the value from that
                return fallbackItem[field.ID];
            }
            else if (fallbackItem != null && fallbackItem.Template.StandardValues != null && item.Versions.Count > 0)
            {
                // there is no fallback item, and there is a version of me, get the fallback standardvalue
                return fallbackItem.Template.StandardValues[field.ID];
            }
 
            return null;
        }