To remove newsletter button you should go to ( Theme Options -> Promo Popup ) and disable ( Show link in the top bar ) option.
You can also remove all top bar to to this go to ( Theme Options -> Header ) and switch of ( Enable top bar ) option.
For remove ( My Account ) and ( Logout ) go to ( Theme Options -> Header ) and switch of ( Enable top links (Register | Sign In) ) option.
To change language links in top bar go to ( Appearance -> Widgets -> Left side top bar area ) and add there empty text widget – it will remove links from the top bar.
also you can add any another widget to it and it will outputed on top bar.