def languages(self, target_lang=None):
        if self.service_type == 'GT':
            params = {
                'key': self.api_key,
                'target': target_lang,
            }
        elif self.service_type == 'BT':
            params = {
                'appId': self.api_key,
            }
        r = requests.get(self.get_language_url(), params=params)
        return r.content
Implements the Adadelta optimizer.
dataset/ETHPy150Open rvanlaar/easy-transifex/src/transifex/transifex/addons/gtranslate/models.py/Gtranslate.languages--crossover with--dataset/ETHPy150Open SMART-Lab/smartlearner/smartlearner/optimizers/adadelta.py/Adadelta.__init__