lib/classes/Swift/Mime/Headers/AbstractHeader.php
public function setLanguage($lang)
    {
        $this->clearCachedValueIf($this->lang != $lang);
        $this->lang = $lang;
    }
public function setLanguage($lang)
    {
        $this->clearCachedValueIf($this->lang != $lang);
        $this->lang = $lang;
    }
public function setLanguage ( $ lang ) { $ this -> clearCachedValueIf ( $ this -> lang != $ lang ) ; $ this -> lang = $ lang ; }
Set the language used in this Header.

For example, for US English, 'en-us'.
This can be unspecified.

@param string $lang
Set the language used in this Header .