Text Changes: Unify various "Back to..." vs. "Return to..." vs. "Go to..." strings.

Standardize on "Go to..." as a more appropriate option for most cases.

Props garrett-eclipse, kharisblank, audrasjb, ramiy, valentinbora.
Fixes #47235.
Built from https://develop.svn.wordpress.org/trunk@49539


git-svn-id: http://core.svn.wordpress.org/trunk@49277 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-theme-upgrader-skin.php

@@ -124,7 +124,7 @@ class Theme_Upgrader_Skin extends WP_Upgrader_Skin {
 		$update_actions['themes_page'] = sprintf(
 			'<a href="%s" target="_parent">%s</a>',
 			self_admin_url( 'themes.php' ),
-			__( 'Return to Themes page' )
+			__( 'Go to Themes page' )
 		);
 
 		/**