Misc Fixes (#914)

* Fixed the book reader off by one issue with loading last page

* Fixed a case where scanner would not delete a series if another series with same name but different format was added in that same scan.

* Added some missing tag generation (chapter language and summary)

API.Tests/Services/DirectoryServiceTests.cs

@@ -16,20 +16,8 @@ namespace API.Tests.Services
 
     public class DirectoryServiceTests
     {
-        private readonly DirectoryService _directoryService;
         private readonly ILogger<DirectoryService> _logger = Substitute.For<ILogger<DirectoryService>>();
 
-        public DirectoryServiceTests()
-        {
-            var filesystem = new MockFileSystem()
-            {
-
-            };
-
-            _directoryService = new DirectoryService(_logger, filesystem);
-        }
-
-
         #region TraverseTreeParallelForEach
         [Fact]
         public void TraverseTreeParallelForEach_JustArchives_ShouldBe28()