Hello Mr. John and thank you for your prompt reply.
I understand that these errors don't eliminate functionality but in order for the site to get validated through http://wave.webaim.org/ I need to add the text you are referring to.
You replied : "If you want to add some text to those buttons you should deal with the js file, then hide the text using CSS otherwise it would break the layout of the icons."
What I need to know is how to "deal" with the js file.
Which is the file and what change I need to make there? Can you give me an example of what I need to change ie for the button id fr_screenreader_play? and I think I can do the rest.
Also which is the css file I need to edit and how to hide the text so that I will not break the layout of the buttons? Does display:none; will do it?

Thank you in advance
BR
George