chore(i18n,learn): processed translations (#50211)

curriculum/challenges/japanese/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.md

@@ -22,7 +22,7 @@ The `updateRecords` function takes 4 arguments represented by the following func
 -   Your function must always return the entire `records` object.
 -   `value` が空文字列の場合は、指定された `prop` プロパティをアルバムから削除します。
 -   If `prop` isn't `tracks` and `value` isn't an empty string, assign the `value` to that album's `prop`.
--   If `prop` is `tracks` and value isn't an empty string, add the `value` to the end of the album's `tracks` array. You need to create this array first if the album does not have a `tracks` property.
+-   If `prop` is `tracks` and `value` isn't an empty string, you need to update the album's `tracks` array. First, if the album does not have a `tracks` property, assign it an empty array. Then add the `value` as the last item in the album's `tracks` array.
 
 **注:** テストには `recordCollection` オブジェクトのコピーが使用されます。 You should not directly modify the `recordCollection` object.