New: Auto tag series based on Original Language

Closes #5908

src/NzbDrone.Core/AutoTagging/Specifications/OriginalLanguageSpecification.cs

@@ -0,0 +1,37 @@
+using FluentValidation;
+using NzbDrone.Core.Annotations;
+using NzbDrone.Core.Languages;
+using NzbDrone.Core.Tv;
+using NzbDrone.Core.Validation;
+
+namespace NzbDrone.Core.AutoTagging.Specifications
+{
+    public class OriginalLanguageSpecificationValidator : AbstractValidator<OriginalLanguageSpecification>
+    {
+        public OriginalLanguageSpecificationValidator()
+        {
+            RuleFor(c => c.Value).GreaterThanOrEqualTo(0);
+        }
+    }
+
+    public class OriginalLanguageSpecification : AutoTaggingSpecificationBase
+    {
+        private static readonly OriginalLanguageSpecificationValidator Validator = new ();
+
+        public override int Order => 1;
+        public override string ImplementationName => "Original Language";
+
+        [FieldDefinition(1, Label = "Language", Type = FieldType.Select, SelectOptions = typeof(OriginalLanguageFieldConverter))]
+        public int Value { get; set; }
+
+        protected override bool IsSatisfiedByWithoutNegate(Series series)
+        {
+            return Value == series.OriginalLanguage.Id;
+        }
+
+        public override NzbDroneValidationResult Validate()
+        {
+            return new NzbDroneValidationResult(Validator.Validate(this));
+        }
+    }
+}

src/NzbDrone.Core/Languages/OriginalLanguageFieldConverter.cs

@@ -0,0 +1,18 @@
+using System.Collections.Generic;
+using System.Linq;
+using NzbDrone.Core.Annotations;
+
+namespace NzbDrone.Core.Languages
+{
+    public class OriginalLanguageFieldConverter : ISelectOptionsConverter
+    {
+        public List<SelectOption> GetSelectOptions()
+        {
+            return Language.All
+                .Where(l => l.Id >= 0)
+                .OrderBy(l => l.Id > 0).ThenBy(l => l.Name)
+                .ToList()
+                .ConvertAll(v => new SelectOption { Value = v.Id, Name = v.Name });
+        }
+    }
+}