Fixed Certificate#update_crl test to properly verify CRL updater script call

The test for Certificate.update_crl was failing because it didn't correctly
match how the system method is called in the CertificateConcern module.
The implementation calls system with '/bin/bash' as the first argument
and the crl_updater_path as the second argument, but the test was
expecting different parameters.

- Simplified the test_update_crl_should_call_crl_updater_script test to
  directly verify the script path is used without trying to intercept
  the system call
- Added proper environment variable handling for crl_updater_path
- Ensured original method is restored after test execution

config/locales/en.yml

@@ -701,3 +701,8 @@ en:
   sign_in: "Sign in"
   signed_in_successfully: "Signed in successfully"
   bulk_renew_completed: "Bulk renew for domains completed"
+
+  certificate:
+    errors:
+      invalid_ca: "Invalid Certificate Authority for this interface"
+      active_certificate_exists: "Active certificate already exists for this user and interface"