Hello,
1) To translate follow us text go to Appearance > Widgets > edit Instagram widget fields http://prntscr.com/qbl2fr
2) Loco translate > Plugins > Royal core plugin > if we translated the mentioned strings everything is ok.
3) Comments area of the post is translated http://prntscr.com/qbl4tb Could you, please, provide link to page where you still have issues with this?
4) Don’t change the text domain in style.css of the parent theme http://prntscr.com/qbljxl if you did not change them in all the existing files, for example http://prntscr.com/qblkum or translation file based on royal text domain won’t work.
Regards