added copy changes

locales/en/common.json

@@ -21,6 +21,8 @@
   "footer-feedback-link": "Give feedback about this page",
   "footer-copyright-link": "Copyright statement",
   "footer-alternative-languages-link": "Alternative languages",
+  "footer-guidance-link-label": "Planning and Environment Decisions Wales’ guidance and services",
+  "footer-guidance-link": "https://gov.wales/planning-and-environment-decisions-wales/guidance-services",
   "mobile-nav-label": "Menu",
   "signout-label": "Sign out",
   "back-to-top-link": "Back to top",
@@ -39,6 +41,8 @@
   "logged-out-link": "Return to Planning Casework portal",
   "404-not-found-title": "404 - not found",
   "404-not-found-link": "Go back home",
+  "error-page-title": "Error",
+  "error-page-message": "An error occurred on the client",
   "cookie-banner-line-1": "We've saved some files called cookies on your device. These cookies are:",
   "cookie-banner-list-item-1": "essential for the site to work",
   "cookie-banner-line-2": "We would also like to save some cookies to help:",