Translation problems

Hello.
I have a few problems.

1.) Cannot, for the love of God, translate the homepage as it is not in the pages menu (I know it is made from index.php and header.php). Also, I am using Photolistic theme. Here is the link (www.dejanzagar.com), if you click on the english flag, it shows Index of /en. The original language is slovenian.

So, if anybody knows hot to translate it, I would be grateful.

2.) I was able to translate everything except things from template (featured text, meta data and other strings). I tried inserting pll_register_string in fuctions.php (like it was written) and in didn’t worked. The translation did not appeared String translation.

any help would be gladly appreciated.

https://ww.wp.xz.cn/plugins/polylang/