How to remove top green bar

1. Disable all modules from positions: top1, top2, and top3
2. Use Custom CSS to hide green line:
   

   #sp-top-bar {display: none; padding:0; margin:0;}

How to recover flags icons in the language module

 Icons were hidden by template css styles, so you need custom CSS to restore them:

.mod-languages img {display: inline;max-width: 20px;}
.mod-languages .lang-inline {padding: 6px !important; }