feat(web): translate error messages surfaced from API error codes to English

Translates the five client-side error-message maps (world, hunting, combat,
inventory, local-location stores) that re-translate already-English API
error codes back to display text, per design doc §4. Also fixes four
component specs that hard-coded the same German strings when asserting
rendered error text (combat-page, hunt-page, location-interaction-panel,
location-page).

apps/web/src/app/features/combat/combat-page/combat-page.component.spec.ts

@@ -510,12 +510,12 @@ describe('CombatPageComponent', () => {
 
   it('shows an error and retries loading the combat', async () => {
     const fixture = await setup(null);
-    combatStore.error.set('Dieser Kampf wurde nicht gefunden.');
+    combatStore.error.set('This combat could not be found.');
     fixture.detectChanges();
 
     const element = fixture.nativeElement as HTMLElement;
     expect(element.querySelector('[role="alert"]')?.textContent).toContain(
-      'Dieser Kampf wurde nicht gefunden.',
+      'This combat could not be found.',
     );
     element.querySelector<HTMLButtonElement>('[data-combat-retry]')?.click();
 

apps/web/src/app/features/combat/combat.store.spec.ts

@@ -80,7 +80,7 @@ describe('CombatStore', () => {
     await store.startCombat('encounter-1');
 
     expect(store.combat()).toBeNull();
-    expect(store.error()).toBe('Du befindest dich bereits in einem Kampf.');
+    expect(store.error()).toBe("You're already in a combat.");
     expect(store.errorCode()).toBe('COMBAT_ALREADY_ACTIVE');
   });
 
@@ -97,7 +97,7 @@ describe('CombatStore', () => {
 
     await store.startCombat('encounter-1');
 
-    expect(store.error()).toBe('Du bist zu schwer verwundet, um zu kämpfen. Warte, bis du dich erholt hast.');
+    expect(store.error()).toBe("You're too badly wounded to fight. Wait until you've recovered.");
   });
 
   it('loads the running combat and clears the error that sent us looking for it', async () => {
@@ -150,7 +150,7 @@ describe('CombatStore', () => {
 
     await store.loadCombat('unknown');
 
-    expect(store.error()).toBe('Dieser Kampf wurde nicht gefunden.');
+    expect(store.error()).toBe('This combat could not be found.');
   });
 
   it('sends only the ATTACK action and replaces combat with the server response', async () => {

apps/web/src/app/features/combat/combat.store.ts

@@ -4,20 +4,20 @@ import { firstValueFrom } from 'rxjs';
 import { Combat, CombatAction } from '../../core/api/game-api.models';
 import { GameApiService } from '../../core/api/game-api.service';
 
-const GENERIC_ERROR_MESSAGE = 'Der Kampf konnte nicht geladen werden.';
+const GENERIC_ERROR_MESSAGE = 'Could not load the combat.';
 
 // Mirrors the combat error codes returned by the combat endpoints.
 // Unknown/missing codes fall back to `GENERIC_ERROR_MESSAGE`.
 const COMBAT_ERROR_MESSAGES: Readonly<Record<string, string>> = {
-  HUNT_ENCOUNTER_NOT_FOUND: 'Diese Begegnung wurde nicht gefunden.',
-  HUNT_ENCOUNTER_ALREADY_CONSUMED: 'Diese Begegnung wurde bereits genutzt.',
-  INVALID_HUNT_ENCOUNTER: 'Diese Begegnung ist nicht mehr gültig.',
-  CHARACTER_TRAVELLING: 'Du kannst nicht kämpfen, während du unterwegs bist.',
-  CHARACTER_TOO_WOUNDED: 'Du bist zu schwer verwundet, um zu kämpfen. Warte, bis du dich erholt hast.',
-  COMBAT_ALREADY_ACTIVE: 'Du befindest dich bereits in einem Kampf.',
-  COMBAT_NOT_FOUND: 'Dieser Kampf wurde nicht gefunden.',
-  COMBAT_ALREADY_FINISHED: 'Dieser Kampf ist bereits beendet.',
-  COMBAT_NO_POTIONS_REMAINING: 'Du hast keine Tränke mehr.',
+  HUNT_ENCOUNTER_NOT_FOUND: 'This encounter could not be found.',
+  HUNT_ENCOUNTER_ALREADY_CONSUMED: 'This encounter has already been used.',
+  INVALID_HUNT_ENCOUNTER: 'This encounter is no longer valid.',
+  CHARACTER_TRAVELLING: "You can't fight while travelling.",
+  CHARACTER_TOO_WOUNDED: "You're too badly wounded to fight. Wait until you've recovered.",
+  COMBAT_ALREADY_ACTIVE: "You're already in a combat.",
+  COMBAT_NOT_FOUND: 'This combat could not be found.',
+  COMBAT_ALREADY_FINISHED: 'This combat has already ended.',
+  COMBAT_NO_POTIONS_REMAINING: 'You have no potions left.',
 };
 
 @Injectable({ providedIn: 'root' })