Handle locales using comma as floating point separator

src/recipe.rs

@@ -216,6 +216,7 @@ impl IngredientVisitor {
         E: serde::de::Error,
     {
         let mut v = value
+            .replace(',', ".")
             .parse::<f64>()
             .map_err(|e| serde::de::Error::custom(e.to_string()))?;
         let u = match unit.to_lowercase().as_str() {