Fonts Dissapeared After Changing Lang File

Hi, here is the adress:
http://www.plakdunyasi.com/demo/
My fonts dissapeared after changing some language files for template. I checked the administrative setting and all seems to be fine. How to solve this problem.

Question 2. http://www.plakdunyasi.com/demo/index.php/hakk-m-zda
At the bottom facebook "Like It" "Share" are English, how can I translate them.

Question 3. I can not use Turkish characters when I change the language file for bikestore, such as ş ğ ü.
iso code iso 8859-9 for Turkish.
I tried to add it to default.php but it didn't work.

I need to add somethings.
First of all fonts dissapeared after I tried to add latin-extended.

The link was
http://fonts.googleapis.com/css?family=Oswald

I simply made it what google fonts refered
http://fonts.googleapis.com/css?family= ... ,latin-ext

Now I tried to replace it with defaults to try if google link was broken. Turns out even writing the old code doesn't work.

I, however managed to get Squirrel Fonts - Bebes working. Thanks for you helps.

Turns out that my chrome doesn't show the fonts, but IE does. Is there a way to fix it?

Question 3. I can not use Turkish characters when I change the language file for bikestore, such as ş ğ ü.
iso code iso 8859-9 for Turkish.
I tried to add it to default.php but it didn't work.

remains unsolved.

Is there way to solve this, please help me.