diff --git a/source/engine/format.js b/source/engine/format.js
index 79e23bb21..ea9c0e889 100644
--- a/source/engine/format.js
+++ b/source/engine/format.js
@@ -58,7 +58,7 @@ export function formatValue({
 	if (typeof value !== 'number') {
 		return value
 	}
-	const serializedUnit = serialiseUnit(unit, value)
+	const serializedUnit = serialiseUnit(unit, value, language)
 
 	switch (serializedUnit) {
 		case '€':
diff --git a/source/engine/format.test.js b/source/engine/format.test.js
index 577dfeab9..a6db4380f 100644
--- a/source/engine/format.test.js
+++ b/source/engine/format.test.js
@@ -1,5 +1,6 @@
 import { expect } from 'chai'
 import { formatCurrency, formatPercentage, formatValue } from './format'
+import { parseUnit } from 'Engine/units'
 
 describe('format engine values', () => {
 	it('format currencies', () => {
@@ -25,3 +26,23 @@ describe('format engine values', () => {
 		expect(formatValue({ value: 1200, language: 'fr' })).to.equal('1 200')
 	})
 })
+
+describe('Units handling', () => {
+	it('translate unit', () => {
+		expect(formatValue({ value: 1, unit: 'jour', language: 'fr' })).to.equal(
+			'1 jour'
+		)
+		expect(formatValue({ value: 1, unit: 'jour', language: 'en' })).to.equal(
+			'1 day'
+		)
+	})
+
+	it('pluralize unit', () => {
+		expect(formatValue({ value: 2, unit: 'jour', language: 'fr' })).to.equal(
+			'2 jours'
+		)
+		expect(
+			formatValue({ value: 7, unit: parseUnit('jour/semaine'), language: 'fr' })
+		).to.equal('7 jours / semaine')
+	})
+})
diff --git a/source/engine/units.js b/source/engine/units.js
index 987a1fd0e..0dc26fd11 100644
--- a/source/engine/units.js
+++ b/source/engine/units.js
@@ -18,10 +18,10 @@ let printUnits = (units, count) =>
 		.join('-')
 
 const plural = 2
-export let serialiseUnit = (rawUnit, count = plural) => {
+export let serialiseUnit = (rawUnit, count = plural, lng = undefined) => {
 	if (typeof rawUnit !== 'object') {
 		return typeof rawUnit === 'string'
-			? i18n.t(`units:${rawUnit}`, { count })
+			? i18n.t(`units:${rawUnit}`, { count, lng })
 			: rawUnit
 	}
 	let unit = simplify(rawUnit),