Hi, I was wondering if it us possible to disable automatic transforming of first letters of the words from the language file. It gets weird to see the tittles in my native language with all words in capital first letters and it makes browsing my site a bit confusing. 

Example of what I'm taking about  "Join Now"  to "Join now".

You'll have to look through the CSS and change the text-transform property.  This can be done with the Firebug add-on for Firefox, or any other browser with built-in developer tools.

Is the CSS filed name to chage called exactly " text-transform" or it is a variable?

That's a CSS property, not a file name.  Again, disable cacheing, load up the browser's developer tools, and see where to make the changes.  I might be willing to tell you the files, but I'll need to know what you want to edit.

I understand that it is a CSS property. I just didn't  express myself correctly. I installed  the Firebug in Firefox and found the text-transform: uppercase capitalize in the base/css directory in files common.css, forms_adv.css, general.css and top_menu.css.

After editing the files mentioned  I can choose what to capitalize ad what not to capitalize . Thenks for the help! :)