PHPmailer::getTranslations():  translations should always be available
PHPmailer::getTranslations():  translations should always be available

If the language has not been set yet, it should return the English text strings.

Fixes 2419

PHPMailer/PHPMailer,nawawi/PHPMailer,jimjag/PHPMailer,nawawi/PHPMailer,PHPMailer/PHPMailer,jimjag/PHPMailer