Title: Unread in category/feed vs. global

Distinguish in the title of the page between the number of unread articles in the category/feed displayed vs. the total number of unread articles.
Before, it was confusing when showing the total number of unread articles next to the name of the category/feed.

![tmp_screenshot_2013-09-13-21-51-432063654071](https://f.cloud.github.com/assets/1008324/1141183/f8ee2c64-1cae-11e3-9c32-077013d97012.png)