Removes the AdditionalData properties for EntitySlim and moves them to real properties of IDocumentEntitySlim, renames PublishedCultureInfos to not be plural

src/Umbraco.Core/Models/Entities/DocumentEntitySlim.cs

@@ -15,6 +15,8 @@ namespace Umbraco.Core.Models.Entities
             set => _cultureNames = value;
         }
 
+        public ContentVariation Variations { get; set; }
+
         /// <inheritdoc />
         public bool Published { get; set; }
 

src/Umbraco.Core/Models/Entities/EntitySlim.cs

@@ -25,18 +25,7 @@ namespace Umbraco.Core.Models.Entities
         /// Gets an entity representing "root".
         /// </summary>
         public static readonly IEntitySlim Root = new EntitySlim { Path = "-1", Name = "root", HasChildren = true };
-
-        /// <summary>
-        /// Gets the AdditionalData key for culture names.
-        /// </summary>
-        public const string AdditionalCultureNames = "CultureNames";
-
-        /// <summary>
-        /// Gets the AdditionalData key for variations.
-        /// </summary>
-        public const string AdditionalVariations = "Variations";
-
-
+        
         // implement IEntity
 
         /// <inheritdoc />

src/Umbraco.Core/Models/Entities/IDocumentEntitySlim.cs

@@ -10,6 +10,8 @@ namespace Umbraco.Core.Models.Entities
         //fixme we need to supply more information than this and change this property name. This will need to include Published/Editor per variation since we need this information for the tree
         IReadOnlyDictionary<string, string> CultureNames { get; }
 
+        ContentVariation Variations { get; }
+
         /// <summary>
         /// At least one variation is published
         /// </summary>

src/Umbraco.Core/Models/PublishedContent/IPublishedContent.cs

@@ -122,7 +122,7 @@ namespace Umbraco.Core.Models.PublishedContent
         /// <summary>
         /// Gets culture infos for a culture.
         /// </summary>
-        PublishedCultureInfos GetCulture(string culture = null);
+        PublishedCultureInfo GetCulture(string culture = null);
 
         /// <summary>
         /// Gets culture infos.
@@ -132,7 +132,7 @@ namespace Umbraco.Core.Models.PublishedContent
         /// the cultures that are published. For a draft content, those that are 'available' ie
         /// have a non-empty content name.</para>
         /// </remarks>
-        IReadOnlyDictionary<string, PublishedCultureInfos> Cultures { get; }
+        IReadOnlyDictionary<string, PublishedCultureInfo> Cultures { get; }
 
         /// <summary>
         /// Gets the type of the content item (document, media...).

src/Umbraco.Core/Models/PublishedContent/PublishedContentWrapped.cs

@@ -100,10 +100,10 @@ namespace Umbraco.Core.Models.PublishedContent
         public virtual string GetUrl(string culture = null) => _content.GetUrl(culture);
 
         /// <inheritdoc />
-        public PublishedCultureInfos GetCulture(string culture = null) => _content.GetCulture(culture);
+        public PublishedCultureInfo GetCulture(string culture = null) => _content.GetCulture(culture);
 
         /// <inheritdoc />
-        public IReadOnlyDictionary<string, PublishedCultureInfos> Cultures => _content.Cultures;
+        public IReadOnlyDictionary<string, PublishedCultureInfo> Cultures => _content.Cultures;
 
         /// <inheritdoc />
         public virtual PublishedItemType ItemType => _content.ItemType;

src/Umbraco.Core/Models/PublishedContent/PublishedCultureInfos.cs

@@ -6,12 +6,12 @@ namespace Umbraco.Core.Models.PublishedContent
     /// <summary>
     /// Contains culture specific values for <see cref="IPublishedContent"/>.
     /// </summary>
-    public class PublishedCultureInfos
+    public class PublishedCultureInfo
     {
         /// <summary>
-        /// Initializes a new instance of the <see cref="PublishedCultureInfos"/> class.
+        /// Initializes a new instance of the <see cref="PublishedCultureInfo"/> class.
         /// </summary>
-        public PublishedCultureInfos(string culture, string name, DateTime date)
+        public PublishedCultureInfo(string culture, string name, DateTime date)
         {
             if (string.IsNullOrWhiteSpace(culture)) throw new ArgumentNullOrEmptyException(nameof(culture));
             if (string.IsNullOrWhiteSpace(name)) throw new ArgumentNullOrEmptyException(nameof(name));