Add basic language switching ability

osu.Game/Localisation/ResourceManagerLocalisationStore.cs

@@ -0,0 +1,57 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
+using System.Resources;
+using System.Threading.Tasks;
+using osu.Framework.Localisation;
+
+namespace osu.Game.Localisation
+{
+    public class ResourceManagerLocalisationStore : ILocalisationStore
+    {
+        private readonly Dictionary<string, ResourceManager> resourceManagers = new Dictionary<string, ResourceManager>();
+
+        public ResourceManagerLocalisationStore(string cultureCode)
+        {
+            EffectiveCulture = new CultureInfo(cultureCode);
+        }
+
+        public void Dispose()
+        {
+        }
+
+        public string Get(string lookup)
+        {
+            var split = lookup.Split(':');
+
+            string ns = split[0];
+            string key = split[1];
+
+            if (!resourceManagers.TryGetValue(ns, out var manager))
+                resourceManagers[ns] = manager = new ResourceManager(ns, GetType().Assembly);
+
+            return manager.GetString(key, EffectiveCulture);
+        }
+
+        public Task<string> GetAsync(string lookup)
+        {
+            return Task.FromResult(Get(lookup));
+        }
+
+        public Stream GetStream(string name)
+        {
+            throw new NotImplementedException();
+        }
+
+        public IEnumerable<string> GetAvailableResources()
+        {
+            throw new NotImplementedException();
+        }
+
+        public CultureInfo EffectiveCulture { get; }
+    }
+}