Enhance school creation and staffing management with native language support

- Updated protocol documentation to include `nativeLanguages` in `nameSets` and added `nativeLanguage` to school creation options.
- Enhanced the UI for school creation to allow selection of native languages, improving user experience.
- Revised API interfaces to accommodate new native language features, ensuring proper data handling.
- Improved localization strings to support new native language functionalities in both English and Russian.
- Updated tests to validate the new native language features and ensure robust functionality in staffing scenarios.

src/HSchool.Server/Game/GameLoopService.cs

@@ -328,10 +328,23 @@ internal sealed class GameLoopService(
                 return;
             }
 
+            if (!catalog.NameSets.TryGetValue(nameSetId, out var names))
+            {
+                command.Result.TrySetResult(new SchoolCreationOutcome(null, SchoolCreationError.UnknownNameSet));
+                return;
+            }
+
+            if (!string.IsNullOrWhiteSpace(command.NativeLanguage) && !NativeLanguages.Allows(names, command.NativeLanguage))
+            {
+                command.Result.TrySetResult(new SchoolCreationOutcome(null, SchoolCreationError.UnknownNativeLanguage));
+                return;
+            }
+
             var id = _nextId++;
             store.WriteNextId(_nextId);
+            var nativeLanguage = NativeLanguages.Pick(names, id, command.NativeLanguage, rollIfOmitted: true);
 
-            var worker = SpawnWorker(id, normalized, command.StartDate, running: true, ClockSpeed.DefaultIndex, isNew: true, packIds, command.Map, nameSetId);
+            var worker = SpawnWorker(id, normalized, command.StartDate, running: true, ClockSpeed.DefaultIndex, isNew: true, packIds, command.Map, nameSetId, nativeLanguage);
             Track(worker);
             worker.Start();
 
@@ -499,6 +512,7 @@ internal sealed class GameLoopService(
                 save.ModIds,
                 save.Map,
                 save.NameSetId,
+                save.NativeLanguage,
                 save.Presence);
             worker.Start();
 
@@ -547,6 +561,7 @@ internal sealed class GameLoopService(
         IReadOnlyList<string>? modIds,
         MapLayout? map,
         string? nameSetId,
+        string? nativeLanguage,
         IReadOnlyList<PresenceSnapshot>? presence = null) =>
         new(
             id,
@@ -558,6 +573,7 @@ internal sealed class GameLoopService(
             modIds,
             map,
             nameSetId,
+            nativeLanguage,
             presence,
             _options,
             clients,