Administration: Remove self-reference ("we") in WordPress Admin.

This changes updates many strings to remove self-references to an undefined "we" collective across the WordPress Administration.

The goal of this change is to better match the guidelines and recommendations set forth in the make/core handbook, specifically:

> the word "we" should be avoided (…) unless its made very clear which group is speaking.

Props johnbillion, shital-patel, audrasjb, marybaum, SergeyBiryukov, peterwilsoncc, johnjamesjacoby, kebbet, costdev, chaion07, davidbaumwald.
Fixes #46057.


git-svn-id: https://develop.svn.wordpress.org/trunk@53131 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/upgrade.php

@@ -137,7 +137,7 @@ else :
 			}
 			?>
 	<h1><?php _e( 'Database Update Required' ); ?></h1>
-<p><?php _e( 'WordPress has been updated! Before we send you on your way, we have to update your database to the newest version.' ); ?></p>
+<p><?php _e( 'WordPress has been updated! Next and final step is to update your database to the newest version.' ); ?></p>
 <p><?php _e( 'The database update process may take a little while, so please be patient.' ); ?></p>
 <p class="step"><a class="button button-large button-primary" href="upgrade.php?step=1&amp;backto=<?php echo $goback; ?>"><?php _e( 'Update WordPress Database' ); ?></a></p>
 			<?php