Primary menu item labels should be changed

The two labels "Extension list" and "Extension Repository" have two things wrong with them:

• They're using different casing and should use the same (suggest Title Case)
• The first link should be changed to simply "Browse" to avoid both links starting with the same exact word and ending with a word that, to the user, means the same thing (list and repository are both "lists" in the eyes of the user browsing the site).