When I create a new survey, I save/ import/copy a survey, it cannot correctly save. I trace the error is: there is a square brackets in the file "application/models/QuestionGroup.php" line 75,

public function attributeLabels()
{
--> return [
'language' => gt('Language'),
'group_name' => gt('Group name')
];
}

when I change it into:

public function attributeLabels()
{
return array(
'group_name' => gt('Group name'),'language' => gt('Language')
);

}

The project works, BUT can not save CHINESE WORDS.