Philippine peso - Wikipedia

File:NDS obverse 100 Philippine peso bill.jpg - Wikipedia

File:Philippine Peso, 20 Centavo English Obverse.jpg - Wikipedia

File:PHI-110-Japanese Government (Philippines)-5 Pesos (1943).jpg - Wikipedia

File:Japanese-issued 10 Philippine peso banknote (reverse).jpg - Wikipedia

File:5 Peso Coin (Nontagon Shape) Philippines Back.png - Wikipedia

File:JapaneseIssuedPhilippinePeso-Obverse.jpg - Wikipedia

Peso - Wikipedia

File:Japanese-issued 5 Philippine peso banknote, 1942 (obverse).jpg - Wikipedia

Philippine one thousand-peso note - Wikipedia

File:Japanese-issued 1 Philippine peso banknote, 1942 (reverse).jpg - Wikipedia

File:PHI-107A-Japanese Government (Philippines)-5 Pesos (1942).jpg - Wikipedia

File:50-peso VICTORY-CBP banknote reverse.png - Wikipedia

File:NDS reverse 50 Philippine peso bill.jpg - Wikipedia

File:NDS reverse 10 Philippine peso bill (1997).jpg - Wikipedia

Why does Wikipedia still use 'Philippine peso' as the title of the article although the spelling of the currency of the Philippines has been changed from 'peso' to 'piso' since the year