Privacy: Add policy link to login screen.

Personal data collection is more likely for registered users than casual visitors, and the privacy policy might have been updated since a user last logged in. Those changes could impact the collection of personal data from registered users, so it makes sense to provide a link to the policy before users log in.

Props voneff, xkon, melchoyce, chetan200891, desrosj.
Fixes #43721.

Built from https://develop.svn.wordpress.org/trunk@43120


git-svn-id: http://core.svn.wordpress.org/trunk@42949 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/login-rtl.css

@@ -194,6 +194,14 @@ p {
 	color: #124964;
 }
 
+.login .privacy-policy-page-link {
+	text-align: center;
+	width: 100%;
+	position: absolute;
+	bottom: 20px;
+	right: 0;
+}
+
 .login form .input,
 .login input[type="text"] {
 	font-size: 24px;
@@ -252,6 +260,13 @@ body.interim-login {
 	width: device-width;
 }
 
+@media ( max-height: 600px ) {
+	.login .privacy-policy-page-link {
+		position: relative;
+		margin: 60px 0 20px 0;
+	}
+}
+
 @media screen and ( max-height: 550px ) {
 	#login {
 		padding: 20px 0;

wp-admin/css/login.css

@@ -194,6 +194,14 @@ p {
 	color: #124964;
 }
 
+.login .privacy-policy-page-link {
+	text-align: center;
+	width: 100%;
+	position: absolute;
+	bottom: 20px;
+	left: 0;
+}
+
 .login form .input,
 .login input[type="text"] {
 	font-size: 24px;
@@ -252,6 +260,13 @@ body.interim-login {
 	width: device-width;
 }
 
+@media ( max-height: 600px ) {
+	.login .privacy-policy-page-link {
+		position: relative;
+		margin: 60px 0 20px 0;
+	}
+}
+
 @media screen and ( max-height: 550px ) {
 	#login {
 		padding: 20px 0;