Customising Alfresco Share : Recent activities email subject

How to change Alfresco Share : Recent activities email subject line?
I am seeing lot of people are asking this question in Alfresco Forum and I found the way!

In Alfresco activities feed is implemented as sub-system,so if you load the custom properties with the modified subject line, it will pick-up and it is not picking up in Alfresco instance.
Finally, I extended the activitiesFeed subsystem with the modified properties values and now Alfresco Repository is happy. Yes, now the alfresco recent activities email subject line is changed with my own application name.

Here are the configuration values.

Activities Feed subsystem extension path:
C:\<alf_directory>\tomcat\webapps\alfresco\WEB-INF\classes\alfresco\extension\subsystems\ActivitiesFeed\default\default\activities-feed-context.xml


Contents of activities-feed-context.xml:
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE beans PUBLIC '-//SPRING//DTD BEAN//EN' 'http://www.springframework.org/dtd/spring-beans.dtd'>

<beans>
<bean id="activitiesResourceBundles" class="org.alfresco.i18n.ResourceBundleBootstrapComponent">
<property name="resourceBundles">
<list>
<value>alfresco.extension.messages.activities-service</value>
<value>alfresco.extension.messages.activities-service_en</value>
</list>
</property>
</bean>
</beans>


Contents of activities-service.properties:
activities.feed.notifier.email.subject=My Custom Product : Recent Activities

Please note : This is tested against Alfresco Enterprise 5.0.2.