fix(i18n): restore localized noteText in all non-English certificate locales

- The certificate section's noteText had previously been translated into
  Chinese, German, Spanish, and French but was inadvertently overwritten
  with an English string when the individual certificate delete feature
  was introduced.
- All four locales now carry properly translated text that also reflects
  the updated policy: expired or expiring production certificates that
  are not attached to a proxy host are now eligible for deletion.
- Newly introduced keys (deleteConfirmExpiring and other delete-related
  keys) remain as English placeholders pending professional translation,
  which is the established pattern for this project.

frontend/src/locales/de/translation.json

@@ -173,7 +173,7 @@
     "uploadSuccess": "Zertifikat erfolgreich hochgeladen",
     "uploadFailed": "Fehler beim Hochladen des Zertifikats",
     "note": "Hinweis",
-    "noteText": "You can delete custom certificates, staging certificates, and expired production certificates that are not attached to any proxy host. Active production certificates are automatically renewed by Caddy.",
+    "noteText": "Sie können benutzerdefinierte Zertifikate, Staging-Zertifikate sowie abgelaufene oder ablaufende Produktionszertifikate löschen, die keinem Proxy-Host zugeordnet sind. Aktive Produktionszertifikate werden von Caddy automatisch erneuert.",
     "provider": "Provider",
     "deleteTitle": "Delete Certificate",
     "deleteConfirmCustom": "This will permanently delete this certificate. A backup will be created first.",

frontend/src/locales/es/translation.json

@@ -173,7 +173,7 @@
     "uploadSuccess": "Certificado subido exitosamente",
     "uploadFailed": "Error al subir el certificado",
     "note": "Nota",
-    "noteText": "You can delete custom certificates, staging certificates, and expired production certificates that are not attached to any proxy host. Active production certificates are automatically renewed by Caddy.",
+    "noteText": "Puedes eliminar certificados personalizados, certificados de staging y certificados de producción vencidos o por vencer que no estén vinculados a ningún host proxy. Los certificados de producción activos se renuevan automáticamente mediante Caddy.",
     "provider": "Provider",
     "deleteTitle": "Delete Certificate",
     "deleteConfirmCustom": "This will permanently delete this certificate. A backup will be created first.",

frontend/src/locales/fr/translation.json

@@ -173,7 +173,7 @@
     "uploadSuccess": "Certificat téléversé avec succès",
     "uploadFailed": "Échec du téléversement du certificat",
     "note": "Note",
-    "noteText": "You can delete custom certificates, staging certificates, and expired production certificates that are not attached to any proxy host. Active production certificates are automatically renewed by Caddy.",
+    "noteText": "Vous pouvez supprimer les certificats personnalisés, les certificats de staging et les certificats de production expirés ou arrivant à expiration qui ne sont associés à aucun hôte proxy. Les certificats de production actifs sont renouvelés automatiquement par Caddy.",
     "provider": "Provider",
     "deleteTitle": "Delete Certificate",
     "deleteConfirmCustom": "This will permanently delete this certificate. A backup will be created first.",

frontend/src/locales/zh/translation.json

@@ -173,7 +173,7 @@
     "uploadSuccess": "证书上传成功",
     "uploadFailed": "证书上传失败",
     "note": "注意",
-    "noteText": "You can delete custom certificates, staging certificates, and expired production certificates that are not attached to any proxy host. Active production certificates are automatically renewed by Caddy.",
+    "noteText": "您可以删除未附加到任何代理主机的自定义证书、暂存证书以及已过期或即将过期的生产证书。活跃的生产证书由 Caddy 自动续期。",
     "provider": "Provider",
     "deleteTitle": "Delete Certificate",
     "deleteConfirmCustom": "This will permanently delete this certificate. A backup will be created first.",