Change “Notifications” settings page to “E-mail notifications” (#29646)

config/locales/en.yml

@@ -1656,7 +1656,7 @@ en:
     import: Import
     import_and_export: Import and export
     migrate: Account migration
-    notifications: Notifications
+    notifications: E-mail notifications
     preferences: Preferences
     profile: Public profile
     relationships: Follows and followers

config/navigation.rb

@@ -12,7 +12,7 @@ SimpleNavigation::Configuration.run do |navigation|
 
     n.item :preferences, safe_join([fa_icon('cog fw'), t('settings.preferences')]), settings_preferences_path, if: -> { current_user.functional? && !self_destruct } do |s|
       s.item :appearance, safe_join([fa_icon('desktop fw'), t('settings.appearance')]), settings_preferences_appearance_path
-      s.item :notifications, safe_join([fa_icon('bell fw'), t('settings.notifications')]), settings_preferences_notifications_path
+      s.item :notifications, safe_join([fa_icon('envelope fw'), t('settings.notifications')]), settings_preferences_notifications_path
       s.item :other, safe_join([fa_icon('cog fw'), t('preferences.other')]), settings_preferences_other_path
     end