Mille-fleurs (French), also in English millefleur or mille-fleur literally means "thousand flowers" and refers to a background made of many small flowers and plants. It was an especially popular motif in tapestry and other applied arts and crafts during the Middle Ages in Europe.Mille-fleur
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Since I am English - I used the Englishe version

looks like we got us a whole bunch of "LANGUAGE" NAZIS HERE.
If you were talking about a thousand flowers, then yes, Mille-fleurs or mille fleurs, but since you are talking about a breed of chicken, then Mille Fleurs.
If I am talking about the arrow, then la fleche but a breed of chicken, La Fleche.