When you give a banner a border and go over it in your inventory, it reads:
"[INSERT COLOR] Bordure"
I'm fairly sure this is not the right way to spell Border.
EDIT: I'm playing in the English Version of Minecraft
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Looks like this is actually an intended name. MC-64847
@unknown in MC-65209:
Works as intended, the banner used to use Vexillology terms, which are flags. Banners are not flags, thus the terms have been updated to reflect that.
Well, it is French for border.