Update desktop notification help text (#4684)

* Update desktop_notification_settings.jsx

* desktop notification help text

webapp/components/user_settings/desktop_notification_settings.jsx

@@ -105,7 +105,7 @@ export default class DesktopNotificationSettings extends React.Component {
                         <span>
                             <FormattedMessage
                                 id='user.settings.notifications.sounds_info'
-                                defaultMessage='Notification sounds are available on IE11, Edge, Safari and Chrome.'
+                                defaultMessage='Notification sounds are available on IE11, Edge, Safari, Chrome and Mattermost Desktop Apps.'
                             />
                         </span>
                     </div>
@@ -207,7 +207,7 @@ export default class DesktopNotificationSettings extends React.Component {
                 <span>
                     <FormattedMessage
                         id='user.settings.notifications.desktop.durationInfo'
-                        defaultMessage='Sets how long desktop notifications will remain on screen.'
+                        defaultMessage='Sets how long desktop notifications will remain on screen when using Firefox or Chrome. Desktop notifications in Edge and Safari can only stay on screen for a maximum of 5 seconds.'
                     />
                 </span>
             );
@@ -270,7 +270,7 @@ export default class DesktopNotificationSettings extends React.Component {
                 <span>
                     <FormattedMessage
                         id='user.settings.notifications.info'
-                        defaultMessage='Desktop notifications are available on Firefox, Safari, and Chrome.'
+                        defaultMessage='Desktop notifications are available on Edge, Firefox, Safari, Chrome and Mattermost Desktop Apps.'
                     />
                 </span>
                 {soundSection}

webapp/i18n/en.json

@@ -2002,7 +2002,7 @@
   "user.settings.notifications.desktop.allSoundForever": "For all activity, with sound, shown indefinitely",
   "user.settings.notifications.desktop.allSoundTimed": "For all activity, with sound, shown for {seconds} seconds",
   "user.settings.notifications.desktop.duration": "Notification duration",
-  "user.settings.notifications.desktop.durationInfo": "Sets how long desktop notifications will remain on screen.",
+  "user.settings.notifications.desktop.durationInfo": "Sets how long desktop notifications will remain on screen when using Firefox or Chrome. Desktop notifications in Edge and Safari can only stay on screen for a maximum of 5 seconds.",
   "user.settings.notifications.desktop.mentionsFirefoxForever": "For mentions and direct messages, shown indefinitely",
   "user.settings.notifications.desktop.mentionsFirefoxTimed": "For mentions and direct messages, shown for {seconds} seconds",
   "user.settings.notifications.desktop.mentionsNoSoundForever": "For mentions and direct messages, without sound, shown indefinitely",
@@ -2023,7 +2023,7 @@
   "user.settings.notifications.emailInfo": "Email notifications are sent for mentions and direct messages when you are offline or away from {siteName} for more than 5 minutes.",
   "user.settings.notifications.emailNotifications": "Email notifications",
   "user.settings.notifications.header": "Notifications",
-  "user.settings.notifications.info": "Desktop notifications are available on Firefox, Safari, and Chrome.",
+  "user.settings.notifications.info": "Desktop notifications are available on Edge, Firefox, Safari, Chrome and Mattermost Desktop Apps.",
   "user.settings.notifications.never": "Never",
   "user.settings.notifications.noWords": "No words configured",
   "user.settings.notifications.off": "Off",
@@ -2035,7 +2035,7 @@
   "user.settings.notifications.sensitiveUsername": "Your non-case sensitive username \"{username}\"",
   "user.settings.notifications.sensitiveWords": "Other non-case sensitive words, separated by commas:",
   "user.settings.notifications.soundConfig": "Please configure notification sounds in your browser settings",
-  "user.settings.notifications.sounds_info": "Notification sounds are available on IE11, Edge, Safari and Chrome.",
+  "user.settings.notifications.sounds_info": "Notification sounds are available on IE11, Edge, Safari, Chrome and Mattermost Desktop Apps.",
   "user.settings.notifications.teamWide": "Team-wide mentions \"@all\"",
   "user.settings.notifications.title": "Notification Settings",
   "user.settings.notifications.usernameMention": "Your username mentioned \"@{username}\"",