Various accessibility fixes, mostly labeling icons.

conf/locale/locale_en-US.ini

@@ -24,6 +24,7 @@ captcha = Captcha
 repository = Repository
 organization = Organization
 mirror = Mirror
+new = New
 new_repo = New Repository
 new_migrate = New Migration
 new_fork = New Fork Repository
@@ -38,6 +39,7 @@ pull_requests = Pull Requests
 issues = Issues
 
 cancel = Cancel
+more = More
 
 [install]
 install = Installation
@@ -724,3 +726,10 @@ months = %d months %s
 years = %d years %s
 raw_seconds = seconds
 raw_minutes = minutes
+
+
+[footer]
+github = GitHub
+twitter = Twitter
+gplus = Google+
+weibo = Weibo