Dear serod naidan,
You can search 'Loading the next set of posts' in Your_site\modules\mod_sj_k2_responsive_content\assets\js\jquery.infinitescroll.min.js and translate the sentence.
About 'No more pages to load', you can find in 'Your_site\templates\sj_wallblog\html\mod_sj_k2_responsive_content\default.php'
Thanks