Index: wp-includes/load.php
===================================================================
--- wp-includes/load.php	(revision 35516)
+++ wp-includes/load.php	(working copy)
@@ -397,7 +397,14 @@
 
 	if ( is_wp_error( $prefix ) ) {
 		wp_load_translations_early();
-		wp_die( __( '<strong>ERROR</strong>: <code>$table_prefix</code> in <code>wp-config.php</code> can only contain numbers, letters, and underscores.' ) );
+		wp_die(
+			sprintf(
+				/* translators: 1: $table_prefix 2: wp-config.php */
+				__( '<strong>ERROR</strong>: %1$s in %2$s can only contain numbers, letters, and underscores.' ),
+				'<code>$table_prefix</code>',
+				'<code>wp-config.php</code>'
+			);
+		);
 	}
 }