I18N: Use a consistent wording for "Unable to write to file" strings.

Props ramiy.
Fixes #48862.

git-svn-id: https://develop.svn.wordpress.org/trunk@47344 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/setup-config.php

@@ -396,7 +396,7 @@ switch ( $step ) {
 	<p>
 			<?php
 			/* translators: %s: wp-config.php */
-			printf( __( 'Sorry, but I can&#8217;t write the %s file.' ), '<code>wp-config.php</code>' );
+			printf( __( 'Unable to write to %s file.' ), '<code>wp-config.php</code>' );
 			?>
 </p>
 <p>