Fix marquee behavior and unify marquee settings

lib/marquee-settings.ts

@@ -97,26 +97,38 @@ function normalizeLocaleSettings(value: unknown, defaults: MarqueeLocaleSettings
   };
 }
 
+export function syncMarqueeSettingsToGermanSource(settings: MarqueeSettings): MarqueeSettings {
+  const source = settings.locales.de;
+
+  return {
+    locales: {
+      de: { ...source },
+      en: { ...source },
+      ar: { ...source },
+    },
+  };
+}
+
 export function parseMarqueeSettingsValue(rawValue?: string | null): MarqueeSettings {
   const defaults = buildDefaultMarqueeSettings();
 
   if (!rawValue) {
-    return defaults;
+    return syncMarqueeSettingsToGermanSource(defaults);
   }
 
   try {
     const parsed = JSON.parse(rawValue) as { locales?: Record<string, unknown> };
     const locales = parsed && typeof parsed === "object" ? parsed.locales : undefined;
 
-    return {
+    return syncMarqueeSettingsToGermanSource({
       locales: {
         ar: normalizeLocaleSettings(locales?.ar, defaults.locales.ar),
         en: normalizeLocaleSettings(locales?.en, defaults.locales.en),
         de: normalizeLocaleSettings(locales?.de, defaults.locales.de),
       },
-    };
+    });
   } catch {
-    return defaults;
+    return syncMarqueeSettingsToGermanSource(defaults);
   }
 }