to use model_type param we'll have to update DeepL SDK
 
right now we use 1.8.0
latest is 1.10.0also to actually use that param we'll have to change code a little bit as we don't set that param right now (it wasn't there) (edited) 
 
so: # update DeepL SDK version

1. create new setting for new parameter
2. set new parameter for translation requests

 
from code side: # new option should be introduced into \MittagQI\Translate5\Plugins\DeepL\Api\DTO\Request\TranslateOptions::__construct

1. set to DTO here: \editor_Plugins_DeepL_Connector::createTranslateResponse by fetching it from $this->config->runtimeOptions->plugins->DeepL->modelType similar to how formality is set there
2. and then used here \MittagQI\Translate5\Plugins\DeepL\Api\DeepLApi::translate just as other params used.