The official flag of French Guiana is that of France's, but those who live there sometimes say the following is their flag:
"On the Paris' flag" is "sur le drapeau de Paris" in French. The flag of the town of Paris (different from the French flag) is blue and red with a ship in the centre.
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flag of France -> drapeau de la France
'le drapeau' (masculine noun)
'on this day' in french is 'ce jour-là'
France has no 'flag day'. That celebration doesn't exist in France, and the national day in on the 14th of July to mark the storming of the Bastille and the beginning of the French revolution.
The flag is "le drapeau" (masc.) in French. The French flag is "le drapeau français".
Flag is translated 'drapeau' (masc.) in French.
Per day is 'par jour' in French.
flag = drapeau
"the colors of the Belgian flag" translates as "les couleurs du drapeau Belge" in French. These colors are black, yellow and red, that reads "noir, jaune, rouge" in French.