I have a site with many pages (30MM+ indexed) and have been getting a extremely high number of URLs on your site warning message for a long time. I'm thinking of reducing the numbers of URLs Google sees especially between similar pages, specifically on pages that have a different language template but have the same content. Current for every page I have this in my <head>:  <link rel=alternate hreflang=en x-default href=http://mydomain.com/dir/page />  <link rel=alternate hreflang=ja href=http://ja.mydomain.com/dir/page />  <link rel=alternate hreflang=ko href=http://ko.mydomain.com/dir/page />  <link rel=alternate hreflang=th href=http://th.mydomain.com/dir/page />  <link rel=alternate hreflang=es href=http://es.mydomain.com/dir/page />  <link rel=alternate hreflang=pt href=http://pt.mydomain.com/dir/page />Will adding a rel=nofollow or a robots.txt disallow help Google focus on the more important pages he has to crawl instead of crawling a different template of the same page? 
Will adding nofollow to alternate language links prevent Googlebot from crawling so many of them?
seo;language;hreflang