Use DTOs to return API requests instead of Database Schema types.

Make use of IHttpStatusCodeResults

API/Controllers/DTOs/AltTitle.cs

@@ -0,0 +1,24 @@
+using System.ComponentModel;
+using System.ComponentModel.DataAnnotations;
+
+namespace API.Controllers.DTOs;
+
+/// <summary>
+/// <see cref="API.Schema.MangaContext.AltTitle"/> DTO
+/// </summary>
+public sealed record AltTitle(string Language, string Title)
+{
+    /// <summary>
+    /// Language of the Title
+    /// </summary>
+    [Required]
+    [Description("Language of the Title")]
+    public string Language { get; init; } = Language;
+    
+    /// <summary>
+    /// Title
+    /// </summary>
+    [Required]
+    [Description("Title")]
+    public string Title { get; init; } = Title;
+}