Give descriptive names to components in RSS

[jefferai]

This patch adds a function to provide a common name for some components; this allows RSS feeds for the various Activities types to show different names for the feeds (instead of just "Activity", making it clear to the user that in fact the RSS feeds are different for each activity.

Note that this also changes the return value in bp_activities_member_rss_link to bp_get_activities_member_feed_link from bp_get_activities_member_rss_link. I found this necessary as I was using the BP Follows plugin for the corresponding function there to be called. I did not find anywhere that the original function name was actually being used.

[boonebgorges]

jefferai - Thanks for the patch. But this is patched against the 1.2 branch, and we're not currently accepting enhancements like this for the 1.2 branch. The way that feed titles are loaded in feeds has changed in the trunk, so I can't apply this patch cleanly. Would you mind checking out a copy of BP trunk ​http://svn.buddypress.org/trun and repatching?

[DJPaul]

Since we swap the links, I agree we should swap the RSS feed names/descriptions, too, but we'll need an updated patch for the current trunk.

[r-a-y]

This is fixed as of v1.8. See #5020.