Fix 4chan board links in header when on other boards.

src/General/Header.coffee

@@ -232,7 +232,7 @@ Header =
         boardID = g.BOARD.ID
       else
         a = $.el 'a',
-          href: "/#{g.BOARD.ID}/"
+          href: "//boards.4chan.org/#{g.BOARD.ID}/"
           textContent: text or g.BOARD.ID
           className: 'current'
         if /-(catalog|archive|expired)/.test(t)

src/Miscellaneous/CatalogLinks.coffee

@@ -68,7 +68,7 @@ CatalogLinks =
 
       # Href is easier than pathname because then we don't have
       # conditions where External Catalog has been disabled between switches.
-      a.href = if Conf['Header catalog links'] then CatalogLinks.catalog(board) else "/#{board}/"
+      a.href = if Conf['Header catalog links'] then CatalogLinks.catalog(board) else "//boards.4chan.org/#{board}/"
 
       if a.dataset.indexOptions and a.hostname is 'boards.4chan.org' and a.pathname.split('/')[2] is ''
         a.href += (if a.hash then '/' else '#') + a.dataset.indexOptions