Prepare for l10n of tournament client (#36827)

## Changes

- Extract / Move l10n initialisation methods
- Add analyser support for tournament project

For the tournament client, it's a bit different around l10n
initialisation compared with the main client. `TournamentGame` needs to
show warning boxes for bracket errors and window size warnings, and we
may make l10n support ready in advance.

---------

Co-authored-by: Dean Herbert <pe@ppy.sh>

osu.Game.Tournament/osu.Game.Tournament.csproj

@@ -10,5 +10,9 @@
   </ItemGroup>
   <ItemGroup Label="Package References">
     <PackageReference Include="Microsoft.Win32.Registry" Version="5.0.0" />
+    <PackageReference Include="ppy.LocalisationAnalyser" Version="2025.1208.0">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
   </ItemGroup>
 </Project>

osu.Game/OsuGame.cs

@@ -36,7 +36,6 @@ using osu.Game.Beatmaps;
 using osu.Game.Collections;
 using osu.Game.Configuration;
 using osu.Game.Database;
-using osu.Game.Extensions;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Containers;
 using osu.Game.Graphics.UserInterface;
@@ -1053,30 +1052,6 @@ namespace osu.Game
         {
             base.LoadComplete();
 
-            var languages = Enum.GetValues<Language>();
-
-            var mappings = languages.Select(language =>
-            {
-#if DEBUG
-                if (language == Language.debug)
-                    return new LocaleMapping("debug", new DebugLocalisationStore());
-#endif
-
-                string cultureCode = language.ToCultureCode();
-
-                try
-                {
-                    return new LocaleMapping(new ResourceManagerLocalisationStore(cultureCode));
-                }
-                catch (Exception ex)
-                {
-                    Logger.Error(ex, $"Could not load localisations for language \"{cultureCode}\"");
-                    return null;
-                }
-            }).Where(m => m != null);
-
-            Localisation.AddLocaleMappings(mappings);
-
             // The next time this is updated is in UpdateAfterChildren, which occurs too late and results
             // in the cursor being shown for a few frames during the intro.
             // This prevents the cursor from showing until we have a screen with CursorVisible = true

osu.Game/OsuGameBase.cs

@@ -306,6 +306,7 @@ namespace osu.Game
 
             MessageFormatter.WebsiteRootUrl = endpoints.WebsiteUrl;
 
+            // Initialise localisation
             frameworkLocale = frameworkConfig.GetBindable<string>(FrameworkSetting.Locale);
             frameworkLocale.BindValueChanged(_ => updateLanguage());
 
@@ -501,6 +502,33 @@ namespace osu.Game
             Fonts.AddStore(new OsuIcon.OsuIconStore(Textures));
         }
 
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            var localeMappings = Enum.GetValues<Language>().Select(language =>
+            {
+#if DEBUG
+                if (language == Language.debug)
+                    return new LocaleMapping("debug", new DebugLocalisationStore());
+#endif
+
+                string cultureCode = language.ToCultureCode();
+
+                try
+                {
+                    return new LocaleMapping(new ResourceManagerLocalisationStore(cultureCode));
+                }
+                catch (Exception ex)
+                {
+                    Logger.Error(ex, $"Could not load localisations for language \"{cultureCode}\"");
+                    return null;
+                }
+            }).Where(m => m != null);
+
+            Localisation.AddLocaleMappings(localeMappings);
+        }
+
         protected override IReadOnlyDependencyContainer CreateChildDependencies(IReadOnlyDependencyContainer parent) =>
             dependencies = new DependencyContainer(base.CreateChildDependencies(parent));