Before we get started, choose what Salesforce view is your preferable tool.

- Classic view 

- Lightning view

Classic view

Custom labels are the caption on buttons, bars, and headlines etc. These can all be customized and/or translated.  

Go to your Setup menu.

Go to Build>Create in the left menu. 

Click Custom labels and find the ARPEDIO labels. These are all represented with "ARPEDIO" in the name. 

Select a label by clicking on a label name.

Hit the button New Local Translations/Overrides.

Select Language and write your Translation Text.

Click Save.

Now, do this for all the custom labels you want translated and/or customized. 

And that's about it. 

Lightning view

Custom labels are the caption on buttons, bars, and headlines etc. These can all be customized and/or translated.  

Go to your Setup menu.

Go to User interface>Custom labels in the left menu. 

Or search for Custom labels

Find the ARPEDIO labels. These are all represented with "ARPEDIO" in the name. 

Select a label by clicking on a label name.

Hit the button New Local Translations/Overrides.

Select Language and write your Translation Text.

Click Save.

Now, do this for all the custom labels you want translated and/or customized. 

And that's about it.