Translate remaining route-level English strings

- Flights-map empty/error states: 'Failed to load routes. Please try
  again.' and 'No directions found.' now use existing translation keys
  (BOARD.LOAD-FAILED + FLIGHTS-MAP.NO_DIRECTIONS_INFO).
- Flights-map feature-flag fallback '404 - Page Not Found / This
  feature is currently unavailable.' reduced to the translated
  PAGE404.HEADER string.
- Suspense fallbacks on /onlineboard, /schedule, /flights-map and
  /popular route pages now render the new SHARED.LOADING ('Загрузка…')
  instead of hardcoded 'Loading...'.

src/features/flights-map/components/FlightsMapStartPage.tsx

@@ -355,7 +355,7 @@ export const FlightsMapStartPage: FC = () => {
                 role="alert"
                 data-testid="map-error"
               >
-                Failed to load routes. Please try again.
+                {t("BOARD.LOAD-FAILED")}
               </div>
             )}
 
@@ -364,7 +364,7 @@ export const FlightsMapStartPage: FC = () => {
                   className="flights-map-start__empty"
                   data-testid="map-no-directions"
                 >
-                  No directions found.
+                  {t("FLIGHTS-MAP.NO_DIRECTIONS_INFO")}
                 </div>
               )}
           </div>

src/i18n/locales/de/common.json

@@ -378,7 +378,8 @@
         "CONNECTION-LIVE": "Live",
         "CONNECTION-RECONNECTING": "Reconnecting…",
         "CONNECTION-OFFLINE": "Offline",
-        "INVALID-PARAMS": "Invalid URL parameters."
+        "INVALID-PARAMS": "Invalid URL parameters.",
+        "LOADING": "Loading…"
     },
     "WARNING": {
         "IFLY_HIGHLIGHT": "Bitte beachten Sie:",

src/i18n/locales/en/common.json

@@ -405,7 +405,8 @@
         "CONNECTION-LIVE": "Live",
         "CONNECTION-RECONNECTING": "Reconnecting…",
         "CONNECTION-OFFLINE": "Offline",
-        "INVALID-PARAMS": "Invalid URL parameters."
+        "INVALID-PARAMS": "Invalid URL parameters.",
+        "LOADING": "Loading…"
     },
     "WARNING": {
         "IFLY_HIGHLIGHT": "Please note:",

src/i18n/locales/es/common.json

@@ -378,7 +378,8 @@
         "CONNECTION-LIVE": "Live",
         "CONNECTION-RECONNECTING": "Reconnecting…",
         "CONNECTION-OFFLINE": "Offline",
-        "INVALID-PARAMS": "Invalid URL parameters."
+        "INVALID-PARAMS": "Invalid URL parameters.",
+        "LOADING": "Loading…"
     },
     "WARNING": {
         "IFLY_HIGHLIGHT": "Nota:",

src/i18n/locales/fr/common.json

@@ -378,7 +378,8 @@
         "CONNECTION-LIVE": "Live",
         "CONNECTION-RECONNECTING": "Reconnecting…",
         "CONNECTION-OFFLINE": "Offline",
-        "INVALID-PARAMS": "Invalid URL parameters."
+        "INVALID-PARAMS": "Invalid URL parameters.",
+        "LOADING": "Loading…"
     },
     "WARNING": {
         "IFLY_HIGHLIGHT": "Remarque:",

src/i18n/locales/it/common.json

@@ -378,7 +378,8 @@
         "CONNECTION-LIVE": "Live",
         "CONNECTION-RECONNECTING": "Reconnecting…",
         "CONNECTION-OFFLINE": "Offline",
-        "INVALID-PARAMS": "Invalid URL parameters."
+        "INVALID-PARAMS": "Invalid URL parameters.",
+        "LOADING": "Loading…"
     },
     "WARNING": {
         "IFLY_HIGHLIGHT": "Attenzione:",

src/i18n/locales/ja/common.json

@@ -378,7 +378,8 @@
         "CONNECTION-LIVE": "Live",
         "CONNECTION-RECONNECTING": "Reconnecting…",
         "CONNECTION-OFFLINE": "Offline",
-        "INVALID-PARAMS": "Invalid URL parameters."
+        "INVALID-PARAMS": "Invalid URL parameters.",
+        "LOADING": "Loading…"
     },
     "WARNING": {
         "IFLY_HIGHLIGHT": "ご注意:",

src/i18n/locales/ko/common.json

@@ -378,7 +378,8 @@
         "CONNECTION-LIVE": "Live",
         "CONNECTION-RECONNECTING": "Reconnecting…",
         "CONNECTION-OFFLINE": "Offline",
-        "INVALID-PARAMS": "Invalid URL parameters."
+        "INVALID-PARAMS": "Invalid URL parameters.",
+        "LOADING": "Loading…"
     },
     "WARNING": {
         "IFLY_HIGHLIGHT": "참고:",

src/i18n/locales/ru/common.json

@@ -405,7 +405,8 @@
         "CONNECTION-LIVE": "Онлайн",
         "CONNECTION-RECONNECTING": "Соединение…",
         "CONNECTION-OFFLINE": "Нет связи",
-        "INVALID-PARAMS": "Неверные параметры URL."
+        "INVALID-PARAMS": "Неверные параметры URL.",
+        "LOADING": "Загрузка…"
     },
     "SMOKE": {
         "HEADING": "Страница проверки"

src/i18n/locales/zh/common.json

@@ -378,7 +378,8 @@
         "CONNECTION-LIVE": "Live",
         "CONNECTION-RECONNECTING": "Reconnecting…",
         "CONNECTION-OFFLINE": "Offline",
-        "INVALID-PARAMS": "Invalid URL parameters."
+        "INVALID-PARAMS": "Invalid URL parameters.",
+        "LOADING": "Loading…"
     },
     "WARNING": {
         "IFLY_HIGHLIGHT": "请注意:",

src/routes/[lang]/flights-map/page.tsx

@@ -32,8 +32,7 @@ export default function FlightsMapPage(): JSX.Element {
   if (!isEnabled) {
     return (
       <div data-testid="flights-map-disabled">
-        <h1>404 - Page Not Found</h1>
-        <p>This feature is currently unavailable.</p>
+        <h1>404 — {t("PAGE404.HEADER")}</h1>
       </div>
     );
   }
@@ -44,7 +43,7 @@ export default function FlightsMapPage(): JSX.Element {
   return (
     <>
       <SeoHead {...seoProps} jsonLd={jsonLd} />
-      <Suspense fallback={<div aria-busy="true">Loading...</div>}>
+      <Suspense fallback={<div aria-busy="true">{t("SHARED.LOADING")}</div>}>
         <FlightsMapStartPage />
       </Suspense>
     </>

src/routes/[lang]/onlineboard/page.tsx

@@ -29,7 +29,7 @@ export default function OnlineBoardPage(): JSX.Element {
   return (
     <>
       <SeoHead {...seoProps} />
-      <Suspense fallback={<div aria-busy="true">Loading...</div>}>
+      <Suspense fallback={<div aria-busy="true">{t("SHARED.LOADING")}</div>}>
         <OnlineBoardStartPage />
       </Suspense>
     </>

src/routes/[lang]/popular/page.tsx

@@ -11,6 +11,7 @@
 
 import { lazy, Suspense, useCallback } from "react";
 import { useParams, useNavigate } from "@modern-js/runtime/router";
+import { useTranslation } from "@/i18n/provider.js";
 import type { PopularRequest } from "@/features/popular-requests/types.js";
 
 const PopularRequestsPanel = lazy(() =>
@@ -20,6 +21,7 @@ const PopularRequestsPanel = lazy(() =>
 );
 
 export default function PopularPage(): JSX.Element {
+  const { t } = useTranslation();
   const routeParams = useParams<{ lang: string }>();
   const lang = routeParams.lang ?? "ru";
   const navigate = useNavigate();
@@ -48,7 +50,7 @@ export default function PopularPage(): JSX.Element {
   );
 
   return (
-    <Suspense fallback={<div aria-busy="true">Loading...</div>}>
+    <Suspense fallback={<div aria-busy="true">{t("SHARED.LOADING")}</div>}>
       <PopularRequestsPanel onRequestClick={handleRequestClick} />
     </Suspense>
   );

src/routes/[lang]/schedule/page.tsx

@@ -29,7 +29,7 @@ export default function SchedulePage(): JSX.Element {
   return (
     <>
       <SeoHead {...seoProps} />
-      <Suspense fallback={<div aria-busy="true">Loading...</div>}>
+      <Suspense fallback={<div aria-busy="true">{t("SHARED.LOADING")}</div>}>
         <ScheduleStartPage />
       </Suspense>
     </>