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();