使用SilverStripe可翻译模块检测当前语言方向

I am using SilverStripe to build a website that should support both English (LTR) and Arabic (RTL) languages. In the templates I need to set the direction of the language.

<html lang="$ContentLocale" dir="$//SomethingHere//">

How can I detect the current language direction and provide that to the template?

In SilverStripe 3.4 the i18n has a get_script_direction function that returns "rtl" or "ltr". This can be called through the template global variable $i18nScriptDirection.

<html lang="$ContentLocale" dir="$i18nScriptDirection">