Enable displayable unit price for price with comma as decimal separator

Retrieve the current decimal separator used to display price (`I18n.toCurrency()`), and check if number is formatted with only if this is `,`. If so, remplace comma by point, to pass the check `!isNaN`, and format unit price

app/assets/javascripts/admin/utils/filters/unlocalize_currency.js.coffee

@@ -0,0 +1,8 @@
+angular.module("admin.utils").filter "unlocalizeCurrency", ()->
+  # Convert string to number using injected currency configuration.
+  (price) ->
+    # used decimal separator from currency configuration
+    decimal_separator = I18n.toCurrency(.1, {precision: 1, unit: ''}).substring(1,2)
+    if (decimal_separator == ",")
+      price = price.replace(",", ".")
+    return parseFloat(price)