fix(core): add missing method_not_allowed translation for error view (#4417)

Fixes #4238

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: imorland

framework/core/locale/core.yml

@@ -721,6 +721,7 @@ core:
       csrf_token_mismatch_return_link: Go back, to try again
       invalid_confirmation_token: This confirmation link has already been used or is invalid.
       not_authenticated: You do not have permission to access this page. Try again after logging in.
+      method_not_allowed: This page does not support that request method.
       not_found: The page you requested could not be found.
       not_found_return_link: "Return to {forum}"
       permission_denied: You do not have permission to access this page.