Add notification privacy option to user settings

Exposes BE functionality we've had for a long time now

src/components/user_settings/user_settings.vue

@@ -379,6 +379,7 @@
           :label="$t('settings.notifications')"
         >
           <div class="setting-item">
+            <h2>{{ $t('settings.notification_setting_filters') }}</h2>
             <div class="select-multiple">
               <span class="label">{{ $t('settings.notification_setting') }}</span>
               <ul class="option-list">
@@ -404,6 +405,17 @@
                 </li>
               </ul>
             </div>
+          </div>
+
+          <div class="setting-item">
+            <h2>{{ $t('settings.notification_setting_privacy') }}</h2>
+            <p>
+              <Checkbox v-model="notificationSettings.privacy_option">
+                {{ $t('settings.notification_setting_privacy_option') }}
+              </Checkbox>
+            </p>
+          </div>
+          <div class="setting-item">
             <p>{{ $t('settings.notification_mutes') }}</p>
             <p>{{ $t('settings.notification_blocks') }}</p>
             <button