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/world/location-page/location-page.component.spec.ts

@@ -220,7 +220,7 @@ describe('LocationPageComponent', () => {
   it('offers a retry when the location could not be loaded', async () => {
     const { fixture, element } = await setup(null);
 
-    error.set('Weltzustand konnte nicht geladen werden.');
+    error.set('Could not load world state.');
     fixture.detectChanges();
 
     expect(element.querySelector('[role="alert"]')?.textContent).toContain(