In `wpdb::db_connect()`, allow the loading of a custom database error template - this is already allowed in `dead_db()`.

In `dead_db()`, move the call to `wp_load_translations_early()` before the inclusion of the `db-error.php` file to allow translation in both locations before the template is loaded.

Props sbruner, kovshenin.
Fixes #25703.



git-svn-id: https://develop.svn.wordpress.org/trunk@27056 602fd350-edb4-49c9-b593-d223f7449a82