Save button for relays translatable (#8539)

config/locales/en.yml

@@ -304,6 +304,7 @@ en:
       enable_hint: Once enabled, your server will subscribe to all public toots from this relay, and will begin sending this server's public toots to it.
       inbox_url: Relay URL
       pending: Waiting for relay's approval
+      save_and_enable: Save and enable
       setup: Setup a relay connection
       status: Status
       title: Relays