Merge branch '7.3.8' into dev-v7

Conflicts:
	build/UmbracoVersion.txt
	src/SolutionInfo.cs
	src/Umbraco.Core/Configuration/UmbracoVersion.cs
	src/Umbraco.Core/Umbraco.Core.csproj
	src/Umbraco.Web.UI/Umbraco.Web.UI.csproj

src/Umbraco.Core/PropertyEditors/ValueConverters/LabelValueConverter.cs

@@ -0,0 +1,28 @@
+using Umbraco.Core.Models.PublishedContent;
+
+namespace Umbraco.Core.PropertyEditors.ValueConverters
+{
+    /// <summary>
+    /// We need this property converter so that we always force the value of a label to be a string
+    /// </summary>
+    /// <remarks>
+    /// Without a property converter defined for the label type, the value will be converted with
+    /// the `ConvertUsingDarkMagic` method which will try to parse the value into it's correct type, but this
+    /// can cause issues if the string is detected as a number and then strips leading zeros. 
+    /// Example: http://issues.umbraco.org/issue/U4-7929
+    /// </remarks>
+    [DefaultPropertyValueConverter]
+    [PropertyValueType(typeof (string))]
+    [PropertyValueCache(PropertyCacheValue.All, PropertyCacheLevel.Content)]
+    public class LabelValueConverter : PropertyValueConverterBase
+    {
+        public override bool IsConverter(PublishedPropertyType propertyType)
+        {
+            return Constants.PropertyEditors.NoEditAlias.Equals(propertyType.PropertyEditorAlias);
+        }
+        public override object ConvertDataToSource(PublishedPropertyType propertyType, object source, bool preview)
+        {
+            return source == null ? string.Empty : source.ToString();
+        }
+    }
+}