If a site name is entered that contains an ampersand, then the feed icon's title attribute and alt text displays the encoded version of the ampersand.
Steps to Replicate:
1) Enter site name with ampersand through admin interface, ie 'Cats & Dogs'.
2) Hover over the feed icon on the front page.
3) Title text displays "Cats & Dogs"
3) Title text displays "Cats & amp ; Dogs"
The problem: The title text is encoded in function
t() with @ parameter and later with
drupal_attributes() in functions
A former similar issue for taxonomy terms: #973328: Special characters are encoded twice in taxonomy term title