After the transition, I did not notice the difference. More for yourself and go to html5. Here's the topic: Https://webmasters.googleblog.com/2014/08/https-as-ranking-signal.html Https://support.google.com/webmasters/answer/34444?hl=en
It is better to translate the whole site. Here we discussed. Http://xoops.org/modules/newbb/viewtopic.php?start=0&topic_id=78171&order=ASC&status=&mode=0
When you go to https in some modules do not work facebook comments, etc. Corrected kaonkretno in News module in news_article.tpl template file, you must simply remove all http:, everything else remains the same. In other modules as well.