adding a new FAQ item about missing reminders

app/src/main/res/values-zh-rCN/strings.xml

@@ -260,6 +260,12 @@
     <string name="faq_4_title">该应用程序支持时区吗？</string>
     <string name="faq_4_text">是的，它支持。默认所有的活动会在您当前的时区下创建。如果您想要改变活动的时区，
         您首先需要在应用程序设定中启用时区选择器，然后在活动详情界面中更改它。这个默认是禁用的因为大多数人都不会用到它。</string>
+    <string name="faq_5_title">The app shows no notifications, why is that?</string>
+    <string name="faq_5_text">
+        <![CDATA[
+            Check your device battery and notification settings, if there is nothing blocking the reminders, or killing the app in the background. You might also want to take a look at <a href="https://dontkillmyapp.com">https://dontkillmyapp.com</a>, it has some useful tips.
+        ]]>
+    </string>
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- App title has to have less than 50 characters. If you cannot squeeze it, just remove a part of it -->
     <string name="app_title">简易日历 Pro - 活动&amp;约会</string>
@@ -270,4 +276,4 @@
         Haven't found some strings? There's more at
         https://github.com/SimpleMobileTools/Simple-Commons/tree/master/commons/src/main/res
     -->
-</resources>
+</resources>