Update System Console mobile app links (#6909)

* Update push_settings.jsx

* Update en.json

webapp/components/admin_console/push_settings.jsx

@@ -129,14 +129,14 @@ export default class PushSettings extends AdminSettings {
             pushServerHelpText = (
                 <FormattedHTMLMessage
                     id='admin.email.mhpnsHelp'
-                    defaultMessage='Download <a href="https://itunes.apple.com/us/app/mattermost/id984966508?mt=8" target="_blank">Mattermost iOS app</a> from iTunes. Download <a href="https://play.google.com/store/apps/details?id=com.mattermost.mattermost&hl=en" target="_blank">Mattermost Android app</a> from Google Play. Learn more about the <a href="http://docs.mattermost.com/deployment/push.html#hosted-push-notifications-service-hpns" target="_blank">Mattermost Hosted Push Notification Service</a>.'
+                    defaultMessage='Download <a href="https://about.mattermost.com/mattermost-ios-app/" target="_blank">Mattermost iOS app</a> from iTunes. Download <a href="https://about.mattermost.com/mattermost-android-app/" target="_blank">Mattermost Android app</a> from Google Play. Learn more about the <a href="http://docs.mattermost.com/deployment/push.html#hosted-push-notifications-service-hpns" target="_blank">Mattermost Hosted Push Notification Service</a>.'
                 />
             );
         } else if (this.state.pushNotificationServerType === PUSH_NOTIFICATIONS_MTPNS) {
             pushServerHelpText = (
                 <FormattedHTMLMessage
                     id='admin.email.mtpnsHelp'
-                    defaultMessage='Download <a href="https://itunes.apple.com/us/app/mattermost/id984966508?mt=8" target="_blank">Mattermost iOS app</a> from iTunes. Download <a href="https://play.google.com/store/apps/details?id=com.mattermost.mattermost&hl=en" target="_blank">Mattermost Android app</a> from Google Play. Learn more about the <a href="http://docs.mattermost.com/deployment/push.html#test-push-notifications-service-tpns" target="_blank">Mattermost Test Push Notification Service</a>.'
+                    defaultMessage='Download <a href="https://about.mattermost.com/mattermost-ios-app/" target="_blank">Mattermost iOS app</a> from iTunes. Download <a href="https://about.mattermost.com/mattermost-android-app/" target="_blank">Mattermost Android app</a> from Google Play. Learn more about the <a href="http://docs.mattermost.com/deployment/push.html#test-push-notifications-service-tpns" target="_blank">Mattermost Test Push Notification Service</a>.'
                 />
             );
         } else {

webapp/i18n/en.json

@@ -256,9 +256,9 @@
   "admin.email.inviteSaltExample": "E.g.: \"bjlSR4QqkXFBr7TP4oDzlfZmcNuH9Yo\"",
   "admin.email.inviteSaltTitle": "Email Invite Salt:",
   "admin.email.mhpns": "Use encrypted, production-quality HPNS connection to iOS and Android apps",
-  "admin.email.mhpnsHelp": "Download <a href=\"https://itunes.apple.com/us/app/mattermost/id984966508?mt=8\" target='_blank'>Mattermost iOS app</a> from iTunes. Download <a href=\"https://play.google.com/store/apps/details?id=com.mattermost.mattermost&hl=en\" target='_blank'>Mattermost Android app</a> from Google Play. Learn more about <a href=\"http://docs.mattermost.com/deployment/push.html#hosted-push-notifications-service-hpns\" target='_blank'>HPNS</a>.",
+  "admin.email.mhpnsHelp": "Download <a href=\"https://about.mattermost.com/mattermost-ios-app\" target='_blank'>Mattermost iOS app</a> from iTunes. Download <a href=\"https://about.mattermost.com/mattermost-android-app\" target='_blank'>Mattermost Android app</a> from Google Play. Learn more about <a href=\"http://docs.mattermost.com/deployment/push.html#hosted-push-notifications-service-hpns\" target='_blank'>HPNS</a>.",
   "admin.email.mtpns": "Use iOS and Android apps on iTunes and Google Play with TPNS",
-  "admin.email.mtpnsHelp": "Download <a href=\"https://itunes.apple.com/us/app/mattermost/id984966508?mt=8\" target='_blank'>Mattermost iOS app</a> from iTunes. Download <a href=\"https://play.google.com/store/apps/details?id=com.mattermost.mattermost&hl=en\" target='_blank'>Mattermost Android app</a> from Google Play. Learn more about <a href=\"http://docs.mattermost.com/deployment/push.html#test-push-notifications-service-tpns\" target='_blank'>TPNS</a>.",
+  "admin.email.mtpnsHelp": "Download <a href=\"https://about.mattermost.com/mattermost-ios-app\" target='_blank'>Mattermost iOS app</a> from iTunes. Download <a href=\"https://about.mattermost.com/mattermost-android-app\" target='_blank'>Mattermost Android app</a> from Google Play. Learn more about <a href=\"http://docs.mattermost.com/deployment/push.html#test-push-notifications-service-tpns\" target='_blank'>TPNS</a>.",
   "admin.email.nofificationOrganizationExample": "E.g.: \"© ABC Corporation, 565 Knight Way, Palo Alto, California, 94305, USA\"",
   "admin.email.notificationDisplayDescription": "Display name on email account used when sending notification emails from Mattermost.",
   "admin.email.notificationDisplayExample": "E.g.: \"Mattermost Notification\", \"System\", \"No-Reply\"",