GA: Update inactive description to match calypso (#6291)

_inc/client/components/module-settings/modules-per-tab-page.jsx

@@ -31,7 +31,6 @@ import {
 	WordAdsSettings
 } from 'components/module-settings/';
 import ExternalLink from 'components/external-link';
-
 import {
 	getSiteAdminUrl,
 	getSiteRawUrl
@@ -132,7 +131,16 @@ const AllModuleSettingsComponent = React.createClass( {
 				if ( 'inactive' === module.configure_url ) {
 					return (
 						<div>
-							{ __( 'Activate this module to use Google Analytics.' ) }
+							{ __(
+								'Google Analytics is a free service that complements our {{a}}built-in stats{{/a}} with different insights into your traffic.' +
+								' WordPress.com stats and Google Analytics use different methods to identify and track activity on your site, so they will ' +
+								'normally show slightly different totals for your visits, views, etc.',
+								{
+									components: {
+										a: <a href={ 'https://wordpress.com/stats/day/' + this.props.siteRawUrl } />
+									}
+								}
+							) }
 						</div>
 					);
 				} else {