Fixing all the TODO, FIXME & HACK comments so they all follow the same layout.

src/Umbraco.Core/Models/UserExtensions.cs

@@ -136,7 +136,7 @@ namespace Umbraco.Core.Models
             try
             {
                 var culture = CultureInfo.GetCultureInfo(userLanguage.Replace("_", "-"));
-                //TODO: This is a hack because we store the user language as 2 chars instead of the full culture
+                // TODO: This is a hack because we store the user language as 2 chars instead of the full culture
                 // which is actually stored in the language files (which are also named with 2 chars!) so we need to attempt
                 // to convert to a supported full culture
                 var result = textService.ConvertToSupportedCultureWithRegionCode(culture);