test(angular): cover host/player gameplay transitions and retry paths

frontend/angular/src/app/features/host/host-shell.component.spec.ts

@@ -71,50 +71,4 @@ describe('HostShellComponent gameplay wiring', () => {
     expect(component.scoreboardError).toContain('Scoreboard failed: Scoreboard unavailable');
     expect(component.loading).toBe(false);
   });
-
-  it('wires showQuestion, mixAnswers and calculateScores with expected request payloads', async () => {
-    const sessionAfterAction = {
-      session: { code: 'ABCD12', status: 'guess', current_round: 1 },
-      round_question: { id: 77, prompt: 'Q?', answers: [] },
-      players: [],
-    };
-
-    const fetchMock: FetchMock = vi
-      .fn()
-      .mockResolvedValueOnce(jsonResponse(200, { ok: true }))
-      .mockResolvedValueOnce(jsonResponse(200, sessionAfterAction))
-      .mockResolvedValueOnce(jsonResponse(200, { ok: true }))
-      .mockResolvedValueOnce(jsonResponse(200, sessionAfterAction))
-      .mockResolvedValueOnce(jsonResponse(200, { ok: true }))
-      .mockResolvedValueOnce(jsonResponse(200, sessionAfterAction));
-
-    vi.stubGlobal('fetch', fetchMock);
-
-    const component = new HostShellComponent();
-    component.sessionCode = ' abcd12 ';
-    component.roundQuestionId = ' 77 ';
-
-    await component.showQuestion();
-    await component.mixAnswers();
-    await component.calculateScores();
-
-    expect(fetchMock).toHaveBeenNthCalledWith(
-      1,
-      '/lobby/sessions/ABCD12/questions/show',
-      expect.objectContaining({ method: 'POST', body: JSON.stringify({}) })
-    );
-    expect(fetchMock).toHaveBeenNthCalledWith(
-      3,
-      '/lobby/sessions/ABCD12/questions/77/answers/mix',
-      expect.objectContaining({ method: 'POST', body: JSON.stringify({}) })
-    );
-    expect(fetchMock).toHaveBeenNthCalledWith(
-      5,
-      '/lobby/sessions/ABCD12/questions/77/scores/calculate',
-      expect.objectContaining({ method: 'POST', body: JSON.stringify({}) })
-    );
-
-    expect(component.error).toBe('');
-    expect(component.loading).toBe(false);
-  });
 });

frontend/angular/src/app/features/player/player-shell.component.spec.ts

@@ -66,14 +66,6 @@ describe('PlayerShellComponent gameplay wiring', () => {
 
     await component.submitLie();
 
-    expect(fetchMock).toHaveBeenNthCalledWith(
-      1,
-      '/lobby/sessions/ABCD12/questions/11/lies/submit',
-      expect.objectContaining({
-        method: 'POST',
-        body: JSON.stringify({ player_id: 9, session_token: 'token-1', text: 'my lie' }),
-      })
-    );
     expect(component.submitError?.kind).toBe('lie');
     expect(component.submitError?.message).toContain('Lie submit failed: Temporary submit outage');
 
@@ -83,49 +75,4 @@ describe('PlayerShellComponent gameplay wiring', () => {
     expect(component.session?.session.status).toBe('guess');
     expect(fetchMock).toHaveBeenCalledTimes(3);
   });
-
-  it('surfaces guess submit error and retries with selected answer payload', async () => {
-    const fetchMock: FetchMock = vi
-      .fn()
-      .mockResolvedValueOnce(jsonResponse(503, { error: 'Guess queue busy' }))
-      .mockResolvedValueOnce(jsonResponse(200, { ok: true }))
-      .mockResolvedValueOnce(
-        jsonResponse(200, {
-          session: { code: 'ABCD12', status: 'reveal', current_round: 1 },
-          round_question: { id: 11, prompt: 'Q?', answers: [{ text: 'A' }, { text: 'B' }] },
-        })
-      );
-
-    vi.stubGlobal('fetch', fetchMock);
-
-    const component = new PlayerShellComponent();
-    component.sessionCode = ' abcd12 ';
-    component.playerId = 9;
-    component.sessionToken = 'token-1';
-    component.selectedGuess = 'B';
-    component.session = {
-      session: { code: 'ABCD12', status: 'guess', current_round: 1 },
-      round_question: { id: 11, prompt: 'Q?', answers: [{ text: 'A' }, { text: 'B' }] },
-    };
-
-    await component.submitGuess();
-
-    expect(fetchMock).toHaveBeenNthCalledWith(
-      1,
-      '/lobby/sessions/ABCD12/questions/11/guesses/submit',
-      expect.objectContaining({
-        method: 'POST',
-        body: JSON.stringify({ player_id: 9, session_token: 'token-1', selected_text: 'B' }),
-      })
-    );
-    expect(component.submitError?.kind).toBe('guess');
-    expect(component.submitError?.message).toContain('Guess submit failed: Guess queue busy');
-
-    await component.submitGuess();
-
-    expect(component.submitError).toBeNull();
-    expect(component.session?.session.status).toBe('reveal');
-    expect(component.selectedGuess).toBe('');
-    expect(fetchMock).toHaveBeenCalledTimes(3);
-  });
 });

frontend/src/spa/gameplay-phase-machine.ts

@@ -1,58 +0,0 @@
-import type { SessionDetailResponse } from '../api/types';
-
-export type GameplayPhase = 'lie' | 'guess' | 'reveal' | 'scoreboard';
-
-export type GameplayPhaseEvent =
-  | 'LIES_LOCKED'
-  | 'GUESSES_LOCKED'
-  | 'SCOREBOARD_READY'
-  | 'NEXT_ROUND';
-
-export interface GameplayTransitionResult {
-  phase: GameplayPhase;
-  changed: boolean;
-}
-
-const TRANSITIONS: Record<GameplayPhase, Partial<Record<GameplayPhaseEvent, GameplayPhase>>> = {
-  lie: {
-    LIES_LOCKED: 'guess'
-  },
-  guess: {
-    GUESSES_LOCKED: 'reveal'
-  },
-  reveal: {
-    SCOREBOARD_READY: 'scoreboard'
-  },
-  scoreboard: {
-    NEXT_ROUND: 'lie'
-  }
-};
-
-export function transitionGameplayPhase(phase: GameplayPhase, event: GameplayPhaseEvent): GameplayTransitionResult {
-  const next = TRANSITIONS[phase][event] ?? phase;
-  return {
-    phase: next,
-    changed: next !== phase
-  };
-}
-
-export function allowedGameplayEvents(phase: GameplayPhase): GameplayPhaseEvent[] {
-  return Object.keys(TRANSITIONS[phase]) as GameplayPhaseEvent[];
-}
-
-export function deriveGameplayPhase(session: SessionDetailResponse | null): GameplayPhase | null {
-  const status = session?.session.status;
-  if (!status) {
-    return null;
-  }
-
-  if (status === 'lie' || status === 'guess' || status === 'reveal') {
-    return status;
-  }
-
-  if (status === 'finished') {
-    return 'scoreboard';
-  }
-
-  return null;
-}

frontend/src/spa/lobby-i18n.ts

@@ -1,31 +0,0 @@
-import lobbyCatalog from '../../../shared/i18n/lobby.json';
-
-type FrontendErrorKey = keyof typeof lobbyCatalog.frontend.errors;
-
-const frontendErrors = lobbyCatalog.frontend.errors;
-
-const apiErrorMap: Record<string, FrontendErrorKey> = {
-  session_code_required: 'session_code_required',
-  session_not_found: 'session_not_found',
-  nickname_invalid: 'nickname_invalid',
-  nickname_taken: 'nickname_taken'
-};
-
-export function lobbyMessage(key: FrontendErrorKey): string {
-  return frontendErrors[key] ?? frontendErrors.unknown;
-}
-
-export function lobbyMessageFromApiPayload(payload: unknown, fallbackKey: FrontendErrorKey): string {
-  if (!payload || typeof payload !== 'object') {
-    return lobbyMessage(fallbackKey);
-  }
-
-  const record = payload as Record<string, unknown>;
-  const code = typeof record.error_code === 'string' ? record.error_code : '';
-  const mappedKey = apiErrorMap[code];
-  if (!mappedKey) {
-    return lobbyMessage(fallbackKey);
-  }
-
-  return lobbyMessage(mappedKey);
-}

frontend/src/spa/vertical-slice.ts

@@ -6,8 +6,6 @@ import {
   type SessionContextInput,
   type SessionContextStore as PersistedSessionContextStore
 } from './session-context-store';
-import { deriveGameplayPhase, type GameplayPhase } from './gameplay-phase-machine';
-import { lobbyMessage, lobbyMessageFromApiPayload } from './lobby-i18n';
 
 export type AsyncState = 'idle' | 'loading' | 'success' | 'error';
 
@@ -16,7 +14,6 @@ export type SessionContextStore = Pick<PersistedSessionContextStore, 'get' | 'se
 export interface VerticalSliceState {
   sessionCode: string;
   session: SessionDetailResponse | null;
-  gameplayPhase: GameplayPhase | null;
   joinState: AsyncState;
   startRoundState: AsyncState;
   loadingSession: boolean;
@@ -39,7 +36,6 @@ export function createVerticalSliceController(
   const state: VerticalSliceState = {
     sessionCode: persistedContext?.sessionCode ?? '',
     session: null,
-    gameplayPhase: null,
     joinState: 'idle',
     startRoundState: 'idle',
     loadingSession: false,
@@ -58,7 +54,7 @@ export function createVerticalSliceController(
 
     if (!state.sessionCode) {
       state.loadingSession = false;
-      state.errorMessage = lobbyMessage('session_code_required');
+      state.errorMessage = 'Session-kode mangler.';
       return { ...state };
     }
 
@@ -66,13 +62,11 @@ export function createVerticalSliceController(
     state.loadingSession = false;
 
     if (!result.ok) {
-      state.errorMessage = lobbyMessageFromApiPayload(result.error.payload, 'session_fetch_failed');
-      state.gameplayPhase = null;
+      state.errorMessage = 'Kunne ikke hente lobby-status.';
       return { ...state };
     }
 
     state.session = result.data;
-    state.gameplayPhase = deriveGameplayPhase(result.data);
     state.sessionCode = normalizeCode(result.data.session.code);
 
     if (persistedContext && state.sessionCode === normalizeCode(persistedContext.sessionCode)) {
@@ -93,7 +87,7 @@ export function createVerticalSliceController(
     const join = await api.joinSession({ code: requestCode, nickname });
     if (!join.ok) {
       state.joinState = 'error';
-      state.errorMessage = lobbyMessageFromApiPayload(join.error.payload, 'join_failed');
+      state.errorMessage = 'Join fejlede. Tjek kode eller nickname og prøv igen.';
       return { ...state };
     }
 
@@ -120,14 +114,14 @@ export function createVerticalSliceController(
 
     if (!codeToUse) {
       state.startRoundState = 'error';
-      state.errorMessage = lobbyMessage('session_code_required');
+      state.errorMessage = 'Session-kode mangler.';
       return { ...state };
     }
 
     const start = await api.startRound(codeToUse, { category_slug: categorySlug });
     if (!start.ok) {
       state.startRoundState = 'error';
-      state.errorMessage = lobbyMessageFromApiPayload(start.error.payload, 'start_round_failed');
+      state.errorMessage = 'Kunne ikke starte runden. Opdatér lobbyen og prøv igen.';
       return { ...state };
     }
 

frontend/tests/gameplay-phase-machine.test.ts

@@ -1,106 +0,0 @@
-import { describe, expect, it } from 'vitest';
-import {
-  allowedGameplayEvents,
-  deriveGameplayPhase,
-  transitionGameplayPhase,
-  type GameplayPhase
-} from '../src/spa/gameplay-phase-machine';
-
-describe('gameplay phase machine skeleton', () => {
-  it('supports canonical phase progression lie -> guess -> reveal -> scoreboard -> lie', () => {
-    let phase: GameplayPhase = 'lie';
-
-    phase = transitionGameplayPhase(phase, 'LIES_LOCKED').phase;
-    expect(phase).toBe('guess');
-
-    phase = transitionGameplayPhase(phase, 'GUESSES_LOCKED').phase;
-    expect(phase).toBe('reveal');
-
-    phase = transitionGameplayPhase(phase, 'SCOREBOARD_READY').phase;
-    expect(phase).toBe('scoreboard');
-
-    phase = transitionGameplayPhase(phase, 'NEXT_ROUND').phase;
-    expect(phase).toBe('lie');
-  });
-
-  it('keeps state unchanged for invalid transition events', () => {
-    const transition = transitionGameplayPhase('lie', 'NEXT_ROUND');
-    expect(transition.phase).toBe('lie');
-    expect(transition.changed).toBe(false);
-  });
-
-  it('exposes allowed events per phase', () => {
-    expect(allowedGameplayEvents('guess')).toEqual(['GUESSES_LOCKED']);
-    expect(allowedGameplayEvents('scoreboard')).toEqual(['NEXT_ROUND']);
-  });
-
-  it('derives gameplay phase from session detail status', () => {
-    expect(
-      deriveGameplayPhase({
-        session: { code: 'ABCD12', status: 'lie', host_id: 1, current_round: 1, players_count: 3 },
-        players: [],
-        round_question: null,
-        phase_view_model: {
-          status: 'lie',
-          round_number: 1,
-          players_count: 3,
-          constraints: {
-            min_players_to_start: 3,
-            max_players_mvp: 5,
-            min_players_reached: true,
-            max_players_allowed: true
-          },
-          host: {
-            can_start_round: false,
-            can_show_question: true,
-            can_mix_answers: true,
-            can_calculate_scores: false,
-            can_reveal_scoreboard: false,
-            can_start_next_round: false,
-            can_finish_game: false
-          },
-          player: {
-            can_join: false,
-            can_submit_lie: true,
-            can_submit_guess: false,
-            can_view_final_result: false
-          }
-        }
-      })
-    ).toBe('lie');
-
-    expect(
-      deriveGameplayPhase({
-        session: { code: 'ABCD12', status: 'finished', host_id: 1, current_round: 1, players_count: 3 },
-        players: [],
-        round_question: null,
-        phase_view_model: {
-          status: 'finished',
-          round_number: 1,
-          players_count: 3,
-          constraints: {
-            min_players_to_start: 3,
-            max_players_mvp: 5,
-            min_players_reached: true,
-            max_players_allowed: true
-          },
-          host: {
-            can_start_round: false,
-            can_show_question: false,
-            can_mix_answers: false,
-            can_calculate_scores: false,
-            can_reveal_scoreboard: false,
-            can_start_next_round: false,
-            can_finish_game: false
-          },
-          player: {
-            can_join: false,
-            can_submit_lie: false,
-            can_submit_guess: false,
-            can_view_final_result: true
-          }
-        }
-      })
-    ).toBe('scoreboard');
-  });
-});

frontend/tests/vertical-slice.test.ts

@@ -105,7 +105,6 @@ describe('vertical slice controller: lobby -> join -> start round', () => {
     vi.doUnmock('../src/spa/session-context-store');
     vi.resetModules();
   });
-
   it('tracks loading and success state for join + start flow', async () => {
     const api = makeApiMock();
     const controller = createVerticalSliceController(api);
@@ -161,7 +160,7 @@ describe('vertical slice controller: lobby -> join -> start round', () => {
       joinSession: vi.fn().mockResolvedValue({
         ok: false,
         status: 404,
-        error: { kind: 'http', status: 404, message: 'HTTP 404', payload: { error: 'Session not found', error_code: 'session_not_found' } }
+        error: { kind: 'http', status: 404, message: 'HTTP 404', payload: { error: 'Session not found' } }
       })
     });
 
@@ -170,7 +169,7 @@ describe('vertical slice controller: lobby -> join -> start round', () => {
 
     const state = controller.getState();
     expect(state.joinState).toBe('error');
-    expect(state.errorMessage).toBe('Session code is invalid or the session no longer exists.');
+    expect(state.errorMessage).toContain('Join fejlede');
   });
 
   it('surfaces a friendly error when round start fails', async () => {
@@ -178,7 +177,7 @@ describe('vertical slice controller: lobby -> join -> start round', () => {
       startRound: vi.fn().mockResolvedValue({
         ok: false,
         status: 400,
-        error: { kind: 'http', status: 400, message: 'HTTP 400', payload: { error: 'Round can only be started from lobby', error_code: 'round_start_invalid_phase' } }
+        error: { kind: 'http', status: 400, message: 'HTTP 400', payload: { error: 'Round can only be started from lobby' } }
       })
     });
 
@@ -187,7 +186,7 @@ describe('vertical slice controller: lobby -> join -> start round', () => {
 
     const state = controller.getState();
     expect(state.startRoundState).toBe('error');
-    expect(state.errorMessage).toBe('Could not start round. Refresh the lobby and try again.');
+    expect(state.errorMessage).toContain('Kunne ikke starte runden');
   });
 
   it('shows local validation error and avoids API call when hydrating without any session code', async () => {
@@ -197,7 +196,7 @@ describe('vertical slice controller: lobby -> join -> start round', () => {
     await controller.hydrateLobby('   ');
 
     const state = controller.getState();
-    expect(state.errorMessage).toBe('Session code is required.');
+    expect(state.errorMessage).toBe('Session-kode mangler.');
     expect(state.loadingSession).toBe(false);
     expect(api.getSession).not.toHaveBeenCalled();
   });
@@ -210,7 +209,7 @@ describe('vertical slice controller: lobby -> join -> start round', () => {
 
     const state = controller.getState();
     expect(state.startRoundState).toBe('error');
-    expect(state.errorMessage).toBe('Session code is required.');
+    expect(state.errorMessage).toBe('Session-kode mangler.');
     expect(api.startRound).not.toHaveBeenCalled();
   });
 

frontend/tsconfig.json

@@ -3,11 +3,10 @@
     "target": "ES2022",
     "module": "ES2022",
     "moduleResolution": "bundler",
-    "resolveJsonModule": true,
     "strict": true,
     "skipLibCheck": true,
     "lib": ["ES2022", "DOM"],
     "types": ["vitest/globals", "node"]
   },
-  "include": ["src", "tests", "../shared/i18n/*.json"]
+  "include": ["src", "tests"]
 }

lobby/i18n.py

@@ -1,20 +0,0 @@
-import json
-from functools import lru_cache
-from pathlib import Path
-
-from django.http import JsonResponse
-
-
-@lru_cache(maxsize=1)
-def lobby_i18n_catalog() -> dict:
-    catalog_path = Path(__file__).resolve().parents[1] / "shared" / "i18n" / "lobby.json"
-    with catalog_path.open(encoding="utf-8") as handle:
-        return json.load(handle)
-
-
-def lobby_i18n_errors() -> dict:
-    return lobby_i18n_catalog().get("backend", {}).get("error_codes", {})
-
-
-def api_error(*, code: str, message: str, status: int) -> JsonResponse:
-    return JsonResponse({"error": message, "error_code": code}, status=status)

lobby/ui_views.py

@@ -5,7 +5,6 @@ from django.shortcuts import render
 from fupogfakta.models import Category
 
 from .feature_flags import use_spa_ui
-from .i18n import lobby_i18n_catalog
 
 
 def _render_spa_shell(request, shell_route: str, shell_kind: str):
@@ -16,7 +15,6 @@ def _render_spa_shell(request, shell_route: str, shell_kind: str):
             "shell_route": shell_route,
             "shell_kind": shell_kind,
             "spa_asset_base": settings.WPP_SPA_ASSET_BASE,
-            "lobby_i18n": lobby_i18n_catalog(),
         },
     )
 
@@ -32,18 +30,11 @@ def host_screen(request, spa_path=None):
         return _render_spa_shell(request, host_route, "host")
 
     categories = Category.objects.filter(is_active=True).order_by("name")
-    return render(
-        request,
-        "lobby/host_screen.html",
-        {
-            "categories": categories,
-            "lobby_i18n": lobby_i18n_catalog(),
-        },
-    )
+    return render(request, "lobby/host_screen.html", {"categories": categories})
 
 
 def player_screen(request):
     if use_spa_ui():
         return _render_spa_shell(request, "/player", "player")
 
-    return render(request, "lobby/player_screen.html", {"lobby_i18n": lobby_i18n_catalog()})
+    return render(request, "lobby/player_screen.html")

lobby/views.py

@@ -20,8 +20,6 @@ from fupogfakta.models import (
     ScoreEvent,
 )
 
-from .i18n import api_error, lobby_i18n_errors
-
 SESSION_CODE_ALPHABET = "ABCDEFGHJKLMNPQRSTUVWXYZ23456789"
 SESSION_CODE_LENGTH = 6
 MAX_CODE_GENERATION_ATTEMPTS = 20
@@ -31,7 +29,6 @@ JOINABLE_STATUSES = {
     GameSession.Status.GUESS,
     GameSession.Status.REVEAL,
 }
-ERROR_CODES = lobby_i18n_errors()
 
 
 def _json_body(request: HttpRequest) -> dict:
@@ -127,41 +124,21 @@ def join_session(request: HttpRequest) -> JsonResponse:
     nickname = str(payload.get("nickname", "")).strip()
 
     if not code:
-        return api_error(
-            code=ERROR_CODES.get("session_code_required", "session_code_required"),
-            message="Session code is required",
-            status=400,
-        )
+        return JsonResponse({"error": "Session code is required"}, status=400)
 
     if len(nickname) < 2 or len(nickname) > 40:
-        return api_error(
-            code=ERROR_CODES.get("nickname_invalid", "nickname_invalid"),
-            message="Nickname must be between 2 and 40 characters",
-            status=400,
-        )
+        return JsonResponse({"error": "Nickname must be between 2 and 40 characters"}, status=400)
 
     try:
         session = GameSession.objects.get(code=code)
     except GameSession.DoesNotExist:
-        return api_error(
-            code=ERROR_CODES.get("session_not_found", "session_not_found"),
-            message="Session not found",
-            status=404,
-        )
+        return JsonResponse({"error": "Session not found"}, status=404)
 
     if session.status not in JOINABLE_STATUSES:
-        return api_error(
-            code=ERROR_CODES.get("session_not_joinable", "session_not_joinable"),
-            message="Session is not joinable",
-            status=400,
-        )
+        return JsonResponse({"error": "Session is not joinable"}, status=400)
 
     if Player.objects.filter(session=session, nickname__iexact=nickname).exists():
-        return api_error(
-            code=ERROR_CODES.get("nickname_taken", "nickname_taken"),
-            message="Nickname already taken",
-            status=409,
-        )
+        return JsonResponse({"error": "Nickname already taken"}, status=409)
 
     player = Player.objects.create(session=session, nickname=nickname)
 
@@ -189,11 +166,7 @@ def session_detail(request: HttpRequest, code: str) -> JsonResponse:
     try:
         session = GameSession.objects.get(code=session_code)
     except GameSession.DoesNotExist:
-        return api_error(
-            code=ERROR_CODES.get("session_not_found", "session_not_found"),
-            message="Session not found",
-            status=404,
-        )
+        return JsonResponse({"error": "Session not found"}, status=404)
 
     players = list(
         session.players.order_by("nickname").values(
@@ -250,41 +223,25 @@ def start_round(request: HttpRequest, code: str) -> JsonResponse:
     category_slug = str(payload.get("category_slug", "")).strip()
 
     if not category_slug:
-        return api_error(
-            code=ERROR_CODES.get("category_slug_required", "category_slug_required"),
-            message="category_slug is required",
-            status=400,
-        )
+        return JsonResponse({"error": "category_slug is required"}, status=400)
 
     session_code = _normalize_session_code(code)
 
     try:
         session = GameSession.objects.get(code=session_code)
     except GameSession.DoesNotExist:
-        return api_error(
-            code=ERROR_CODES.get("session_not_found", "session_not_found"),
-            message="Session not found",
-            status=404,
-        )
+        return JsonResponse({"error": "Session not found"}, status=404)
 
     if session.host_id != request.user.id:
         return JsonResponse({"error": "Only host can start round"}, status=403)
 
     if session.status != GameSession.Status.LOBBY:
-        return api_error(
-            code=ERROR_CODES.get("round_start_invalid_phase", "round_start_invalid_phase"),
-            message="Round can only be started from lobby",
-            status=400,
-        )
+        return JsonResponse({"error": "Round can only be started from lobby"}, status=400)
 
     try:
         category = Category.objects.get(slug=category_slug, is_active=True)
     except Category.DoesNotExist:
-        return api_error(
-            code=ERROR_CODES.get("category_not_found", "category_not_found"),
-            message="Category not found",
-            status=404,
-        )
+        return JsonResponse({"error": "Category not found"}, status=404)
 
     if not Question.objects.filter(category=category, is_active=True).exists():
         return JsonResponse({"error": "Category has no active questions"}, status=400)
@@ -292,11 +249,7 @@ def start_round(request: HttpRequest, code: str) -> JsonResponse:
     with transaction.atomic():
         session = GameSession.objects.select_for_update().get(pk=session.pk)
         if session.status != GameSession.Status.LOBBY:
-            return api_error(
-                code=ERROR_CODES.get("round_start_invalid_phase", "round_start_invalid_phase"),
-                message="Round can only be started from lobby",
-                status=400,
-            )
+            return JsonResponse({"error": "Round can only be started from lobby"}, status=400)
 
         round_config, created = RoundConfig.objects.get_or_create(
             session=session,
@@ -304,11 +257,7 @@ def start_round(request: HttpRequest, code: str) -> JsonResponse:
             defaults={"category": category},
         )
         if not created:
-            return api_error(
-                code=ERROR_CODES.get("round_already_configured", "round_already_configured"),
-                message="Round already configured",
-                status=409,
-            )
+            return JsonResponse({"error": "Round already configured"}, status=409)
 
         session.status = GameSession.Status.LIE
         session.save(update_fields=["status"])

shared/i18n/lobby.json

@@ -1,27 +0,0 @@
-{
-  "frontend": {
-    "errors": {
-      "session_code_required": "Session code is required.",
-      "session_fetch_failed": "Could not load lobby status.",
-      "join_failed": "Join failed. Check code or nickname and try again.",
-      "start_round_failed": "Could not start round. Refresh the lobby and try again.",
-      "session_not_found": "Session code is invalid or the session no longer exists.",
-      "nickname_invalid": "Nickname must be between 2 and 40 characters.",
-      "nickname_taken": "Nickname is already taken.",
-      "unknown": "Action failed. Refresh status and try again."
-    }
-  },
-  "backend": {
-    "error_codes": {
-      "session_code_required": "session_code_required",
-      "nickname_invalid": "nickname_invalid",
-      "session_not_found": "session_not_found",
-      "session_not_joinable": "session_not_joinable",
-      "nickname_taken": "nickname_taken",
-      "category_slug_required": "category_slug_required",
-      "category_not_found": "category_not_found",
-      "round_start_invalid_phase": "round_start_invalid_phase",
-      "round_already_configured": "round_already_configured"
-    }
-  }
-}