public function replacePlaceholdersInEmail(ClientSurvey $client_survey, EmailType $type, string $lang, string $template): array|string 	{ 		switch ($type->value) { 			case EmailType::SurveyStartedOnline->value: 				return $this->replacePlaceholdersInStartedOnlineMail($client_survey, $type, $template, $lang);  			case EmailType::SurveyStartedCombined->value: 				return $this->replacePlaceholdersInStartedCombinedMail($client_survey, $type, $template, $lang);  			case EmailType::AdminPublish->value: 				return $this->replacePlaceholdersInAdminPublishMail($client_survey, $type, $template, $lang);  			default: 				return $template; 		} 	}