Remove hardcoded site title from feed titles

[SergeyBiryukov]

Background: ticket:21233:9

Since [21276], site title is displayed twice in the feeds when Twenty Twelve is activated:

<title>WordPress TrunkWordPress Trunk</title>

In the feed files, wp_title_rss() is already prepended with site title:
http://core.trac.wordpress.org/browser/tags/3.4.1/wp-includes/feed-rss2.php#L24

We should probably remove hardcoded bloginfo_rss('name') and make the whole title filterable.

Related: [5132]

+1

Refreshed after [21332]

I am -1 on this. Aside from this being a backwards compatibility headache, those who use RSS feeds are going to want the hierarchy of a site title always first, so they are listed well in their reader. I would think this is fairly standard. There's no need for it to be the same as <title>. This isn't an aesthetic thing like a site title — someone else is deliberately consuming a feed on their own terms, and we should have some semblance of standardization if possible.

Agreed.