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.

Built from https://develop.svn.wordpress.org/trunk@53131


git-svn-id: http://core.svn.wordpress.org/trunk@52720 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/theme.json

@@ -13,47 +13,46 @@
 			"custom": true,
 			"customDuotone": true,
  			"customGradient": true,
-			"defaultDuotone": true,
 			"defaultGradients": true,
 			"defaultPalette": true,
 			"duotone": [
 				{
-					"name": "Dark grayscale",
+					"name":  "Dark grayscale" ,
 					"colors": [ "#000000", "#7f7f7f" ],
 					"slug": "dark-grayscale"
 				},
 				{
-					"name": "Grayscale",
+					"name":  "Grayscale" ,
 					"colors": [ "#000000", "#ffffff" ],
 					"slug": "grayscale"
 				},
 				{
-					"name": "Purple and yellow",
+					"name":  "Purple and yellow" ,
 					"colors": [ "#8c00b7", "#fcff41" ],
 					"slug": "purple-yellow"
 				},
 				{
-					"name": "Blue and red",
+					"name":  "Blue and red" ,
 					"colors": [ "#000097", "#ff4747" ],
 					"slug": "blue-red"
 				},
 				{
-					"name": "Midnight",
+					"name":  "Midnight" ,
 					"colors": [ "#000000", "#00a5ff" ],
 					"slug": "midnight"
 				},
 				{
-					"name": "Magenta and yellow",
+					"name":  "Magenta and yellow" ,
 					"colors": [ "#c7005a", "#fff278" ],
 					"slug": "magenta-yellow"
 				},
 				{
-					"name": "Purple and green",
+					"name":  "Purple and green" ,
 					"colors": [ "#a60072", "#67ff66" ],
 					"slug": "purple-green"
 				},
 				{
-					"name": "Blue and orange",
+					"name":  "Blue and orange" ,
 					"colors": [ "#1900d8", "#ffa96b" ],
 					"slug": "blue-orange"
 				}