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

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/(auth)/(tabs)/(home,libraries,search,favorites)/jellyseerr/person/[personId].tsx

@@ -88,14 +88,11 @@ export default function page() {
           <Text className='opacity-50'>
             {t("jellyseerr.born")}{" "}
             {data?.details?.birthday &&
-              new Date(data.details.birthday).toLocaleDateString(
-                `${locale}-${region}`,
-                {
-                  year: "numeric",
-                  month: "long",
-                  day: "numeric",
-                },
-              )}{" "}
+              new Date(data.details.birthday).toLocaleDateString(locale, {
+                year: "numeric",
+                month: "long",
+                day: "numeric",
+              })}{" "}
             | {data?.details?.placeOfBirth}
           </Text>
         </>