Never had a theme that bugged me so much.
First there was no page with all available icons (which is absolute standard), so I had to pull that out of the css and write it painfully myself. In the documentation there is written, that every icon on fontawesome works with it, but that is simply not true. It could if you would set it yourself up, but that is not the reason I pay for it.
Second the language can't be changed if the window is smaller (like mobile phone size). Try it in the demo yourself. Only in Full Window mode on desktop the popup with the flags opens up.
Third: Why do these "small" problems creep up and up and up. At this point I wished I hadn't wrote so much code around it, so I could throw it away - I wouldn't even care about the money at this point.
Author response
Hello. Unfair rating...
The list of icons is here: https://fontawesome.com/icons?d=gallery
Why create a whole page and add an extra code that no one needs? This is no longer the standard.
We left the language change in the footer of the template .... to leave the more important components displayed in the header of the template.
You could just write in support and ask about all this - and not write a not fair rating.
Have a nice day.