I thought it worked well: your css instructions for removing the flags from the top bar> But it worked only in the Dutch language, not in the other (english) language.
Yigit suggested:
#header_main .menu-item-language { display: none; }
#header_meta .sub_menu { float: right; margin-right: 15px; }
No sorry, Yigit mentioned
#header_meta .avia_wpml_language_switch { display: none; }
Sorry again! Problem solved. Had to change the css in general styling from English language separately.