With Helper.gg you're able to change the default translation language, by default it is "English", although if you want the bot to translate every message into a certain language you can.

Step 1: Logging into the panel

To do this you need to log into the panel at:

Parent.gg - Login

Step 2: Clicking "Modify"

You need to select your server, then select "Modify"

Step 3: Clicking "Commands"

You need to click "Commands", then click "Translate Command" then select "Message Values"

Step 4: Setting the default language

On the "Translate Guild Language" option, change that to the default language you want the bot to translate ALL messages too.