Add v5 UI settings endpoints

src/Sonarr.Api.V5/Settings/SettingsController.cs

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+using System.Reflection;
+using Microsoft.AspNetCore.Mvc;
+using NzbDrone.Core.Configuration;
+using Sonarr.Http.REST;
+using Sonarr.Http.REST.Attributes;
+
+namespace Sonarr.Api.V5.Config
+{
+    public abstract class ConfigController<TResource> : RestController<TResource>
+        where TResource : RestResource, new()
+    {
+        protected readonly IConfigService _configService;
+
+        protected ConfigController(IConfigService configService)
+        {
+            _configService = configService;
+        }
+
+        protected override TResource GetResourceById(int id)
+        {
+            return GetConfig();
+        }
+
+        [HttpGet]
+        [Produces("application/json")]
+        public TResource GetConfig()
+        {
+            var resource = ToResource(_configService);
+            resource.Id = 1;
+
+            return resource;
+        }
+
+        [RestPutById]
+        [Consumes("application/json")]
+        public virtual ActionResult<TResource> SaveConfig([FromBody] TResource resource)
+        {
+            var dictionary = resource.GetType()
+                .GetProperties(BindingFlags.Instance | BindingFlags.Public)
+                .ToDictionary(prop => prop.Name, prop => prop.GetValue(resource, null));
+
+            _configService.SaveConfigDictionary(dictionary);
+
+            return Accepted(resource.Id);
+        }
+
+        protected abstract TResource ToResource(IConfigService model);
+    }
+}

src/Sonarr.Api.V5/Settings/UiSettingsController.cs

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+using System.Reflection;
+using FluentValidation;
+using Microsoft.AspNetCore.Mvc;
+using NzbDrone.Core.Configuration;
+using NzbDrone.Core.Languages;
+using Sonarr.Http;
+using Sonarr.Http.REST.Attributes;
+
+namespace Sonarr.Api.V5.Config;
+
+[V5ApiController("settings/ui")]
+public class UiSettingsController : ConfigController<UiSettingsResource>
+{
+    private readonly IConfigFileProvider _configFileProvider;
+
+    public UiSettingsController(IConfigFileProvider configFileProvider, IConfigService configService)
+        : base(configService)
+    {
+        _configFileProvider = configFileProvider;
+        SharedValidator.RuleFor(c => c.UiLanguage).Custom((value, context) =>
+        {
+            if (!Language.All.Any(o => o.Id == value))
+            {
+                context.AddFailure("Invalid UI Language value");
+            }
+        });
+
+        SharedValidator.RuleFor(c => c.UiLanguage)
+                       .GreaterThanOrEqualTo(1)
+                       .WithMessage("The UI Language value cannot be less than 1");
+    }
+
+    [RestPutById]
+    public override ActionResult<UiSettingsResource> SaveConfig([FromBody] UiSettingsResource resource)
+    {
+        var dictionary = resource.GetType()
+                                 .GetProperties(BindingFlags.Instance | BindingFlags.Public)
+                                 .ToDictionary(prop => prop.Name, prop => prop.GetValue(resource, null));
+
+        _configFileProvider.SaveConfigDictionary(dictionary);
+        _configService.SaveConfigDictionary(dictionary);
+
+        return Accepted(resource.Id);
+    }
+
+    protected override UiSettingsResource ToResource(IConfigService model)
+    {
+        return UiSettingsResourceMapper.ToResource(_configFileProvider, model);
+    }
+}

src/Sonarr.Api.V5/Settings/UiSettingsResource.cs

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+using NzbDrone.Core.Configuration;
+using Sonarr.Http.REST;
+
+namespace Sonarr.Api.V5.Config;
+
+public class UiSettingsResource : RestResource
+{
+    // Calendar
+    public int FirstDayOfWeek { get; set; }
+    public string? CalendarWeekColumnHeader { get; set; }
+
+    // Dates
+    public string? ShortDateFormat { get; set; }
+    public string? LongDateFormat { get; set; }
+    public string? TimeFormat { get; set; }
+    public string? TimeZone { get; set; }
+    public bool ShowRelativeDates { get; set; }
+
+    public bool EnableColorImpairedMode { get; set; }
+    public string? Theme { get; set; }
+    public int UiLanguage { get; set; }
+}
+
+public static class UiSettingsResourceMapper
+{
+    public static UiSettingsResource ToResource(IConfigFileProvider config, IConfigService model)
+    {
+        return new UiSettingsResource
+        {
+            FirstDayOfWeek = model.FirstDayOfWeek,
+            CalendarWeekColumnHeader = model.CalendarWeekColumnHeader,
+
+            ShortDateFormat = model.ShortDateFormat,
+            LongDateFormat = model.LongDateFormat,
+            TimeFormat = model.TimeFormat,
+            TimeZone = model.TimeZone,
+            ShowRelativeDates = model.ShowRelativeDates,
+
+            EnableColorImpairedMode = model.EnableColorImpairedMode,
+            Theme = config.Theme,
+            UiLanguage = model.UILanguage
+        };
+    }
+}