Ieper is a little town in the "Westhoek" ("Western Corner") in western Belgium. The official language is Dutch (sometimes wrongly called "Flemish"), but in practice people speak a local old regional language called "West-Vlaams" ("West-Flemish"), which is however not used when speaking with people from other regions or in official matters.
The official Dutch name of this town is "Ieper" (NOT "Leper"; the first letter is not a little "L" but a capital "i"). The local West-Flemish population call it in their own West-Flemish dialect "Yper" (which was the official spelling of the official Dutch name before the First World War). French and English speaking people call it sometimes "Ypres" (but with different pronounciations), which was the former official French name in First World War. Due to the fact that the official spelling of the official Dutch name was "Yper" before the First World War, the British pronounced it as "Wipers" and there was even a "Wipers Times", printed in the casemates in the ramparts.