Is this for viewing in panes, or the Tag AW?
Unfortunately, you cannot edit data outputs resulting from expressions, so I don't think there's a way to get check-boxes.
If it's just an alternative label you need for a field, have you tried this?:
Tools > Options > Library & Folders > Manage Library Fields
Click on Language, Change the 'Display' or 'Display (plural)' options to whatever you like