fix: correct invalid BCP 47 language tag in Jellyseerr components

Fix RangeError caused by invalid locale tags (e.g., zh-CN-US) in
multiple Jellyseerr components. The locale variable already contains
a complete BCP 47 language tag (e.g., zh-CN), so concatenating it
with region (e.g., US) creates an invalid tag.

Changes:
- DetailFacts.tsx: Fix 5 occurrences in date and currency formatting
- JellyseerrSeasons.tsx: Fix 1 occurrence in upcoming air date
- person/[personId].tsx: Fix 1 occurrence in birthday formatting

Total: 3 files, 7 fixes

Closes #1130

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Co-Authored-By: Claude <noreply@anthropic.com>

components/series/JellyseerrSeasons.tsx

@@ -69,7 +69,7 @@ const RenderItem = ({ item }: any) => {
     if (airDate) {
       const airDateObj = new Date(airDate);
       if (new Date() < airDateObj) {
-        return airDateObj.toLocaleDateString(`${locale}-${region}`, dateOpts);
+        return airDateObj.toLocaleDateString(locale, dateOpts);
       }
     }
   }, [item, locale, region]);