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/includes/update-core.php

@@ -994,7 +994,7 @@ function update_core( $from, $to ) {
 
 		return new WP_Error(
 			'copy_failed_for_version_file',
-			__( 'The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions.' ),
+			__( 'The update can not be installed because some files could not be copied. This is usually due to inconsistent file permissions.' ),
 			'wp-includes/version.php'
 		);
 	}