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Never mind, problem solved.  

EDIT:

And then again the same problem. I installed Black Pearl theme and the Spanish buttons are not working. I checked the english_language and they have .png extension while spanish_language have .gif extension.

Do I have to rename the buttons in order to get them working?

Thanks for your kind help.

Maybe it's my fault... I'll check those buttons as soon as I have some free time.

Please use English ones in the meantime, or convert them to GIF using Photoshop if you have some free time for doing that.

Thanks MG, I can just rename to the new extension and they work. I'll try to find the time to do it. All variations of Pearl style have the same problem.

Take care!