It did not work. I alredy had remove-query-strings-from-static-resources plugin and setting in the w3 total cache like in the picture (unselected). Added also code to the child theme. I hope it is possible to find solution to this :).
You can either visit this page, wp-content/themes/sparkling/inc/css/font-awesome.css and wp-content/themes/sparkling/inc/css/font-awesome-min.css and remove the query string by hand, it will do the trick.
Now front page size got bigger from 601.9 to 619.9kb and same query string is till there.
Maybe i miss something or it was not the correct line to remove. Fix still needed :).
I soon try to disable all plugins and then enable w3 total chache and remove-query-strings-from-static-resources plugin only and see if it is still there. Maybe some other plugin makes w3 total chache act like that or if it is not possible to do with w3 total chache and i have to choose other chache plugin
It went to the next webfont files and added it to the page. I removed other webfonts 4.6.3 urls also and now it seems ok.
Does Font Awesome Disable plugins exist?
Yes fontawesome is need for the theme icons, I suggest you to use that. Also, still the css file shown with the query string, both the http://hingetee.ee/wp-content/themes/sparkling/inc/css/font-awesome.css and the min.css file. Please try disable/clear the cache, and it will solve the issue.