fix(i18n): add missing bucket column translation key for Sora S3 storage settings

The `admin.settings.soraS3.columns.bucket` key was used in
DataManagementView.vue but missing from both en.ts and zh.ts locale
files, causing the raw translation key to be displayed as a column
header instead of the localized text.

frontend/src/i18n/locales/en.ts

@@ -4378,6 +4378,7 @@ export default {
           provider: 'Type',
           active: 'Active',
           endpoint: 'Endpoint',
+          bucket: 'Bucket',
           storagePath: 'Storage Path',
           capacityUsage: 'Capacity / Used',
           capacityUnlimited: 'Unlimited',