Master page

I'd suggest using one master page and add 3 different javascript webparts and have the visiblity property equal to

LocalizationContext.CurrentCulture.CultureCode == 'en-us'
or
LocalizationContext.CurrentCulture.CultureCode == 'en-gb'
or whatever your localization codes are. Pretty simple solution vs. managing 3 different templates.

Or, you can create three separate master page templates and use them separately for each culture version. Sample screen shot. Documentation link.

I have implement the separate master page but i want to add a unique java script code on each "head" of every master page.

I see, the head section is the same for all languages. In this case, use the macro and IF condition to check the current culture and render appropriate code as suggested by Brenden. The macro could look like this:

{% x = LocalizationContext.CurrentCulture.CultureCode; if (x == "en-us") {return "code for US"} else { if (x == "en-gb") {return "code for UK"} else {return " code for AU"}

Of course, in the head section must be a valid HTML code for this part of the HTML.

So {% x = LocalizationContext.CurrentCulture.CultureCode; if (x == "en-us") {return "javascriptcode"} else { if (x == "el-gr") {return "javascriptcode"} ?

This is working {% x = LocalizationContext.CurrentCulture.CultureCode; if (x == "en-us") {return "javascriptcode"}, the else is not working

well, what is the exact macro code? Keep in mind the HTML markup and so on - maybe you are breaking the macro syntax. Use the macro debug to see how is the macro evaluated and resolved. It depends what "not working" means too - are there any errors? E.g. in the Event log? You may also want to use open condition macros. Please, see the macro syntax page.

Theodoulos,

You've already wasted too much time on this by wanting to use the HEAD section of the page. Just use the we parts as I suggested. Since you are using 3 separate templates, you don't even need a visibility macro.