required ignored in fields inside a list on i18n translations

[paurakhsharma]

Describe the bug
required on fields inside a list field is ignored for i18n transitions.
required is only respected in the first translation but is not respected for other translations.

To Reproduce

1. Clone the repo

git clone https://github.com/surjithctly/neat-starter.git

2. Use the config given below

3. Start local netlify proxy

npx netlify-cms-proxy-server

4. Start local dev server

npm run start

5. Go to http://localhost:8080/admin

6. Click on media channels

7. Click on Add distribution on Writing in ES

8. Publish while channel is empty

Expected behavior
Expected to see error message Channel field is required

Actual Behaviour
Was able to save with empty field

Screenshots

Applicable Versions:

• netlify-cms-app 2.15.30
• netlify-cms-core 2.46.0
• index.js:27 netlify-cms 2.10.150
• Browser version Chrome 92 on MacOS Big Sur 11.4

• Node.JS version: v16.1.0

CMS configuration

i18n:
  structure: single_file
  locales: [en, es, ar, hi, zh]
  default_locale: en

backend:
  # Use netlify identity as backend
  name: git-gateway
  branch: master
  ### enable below lines for github integration ###
  # name: github
  # repo: surjithctly/neat-starter
media_folder: "src/static/img"
public_folder: "/static/img"

# Please run "npx netlify-cms-proxy-server" for local backend
local_backend: true
# publish_mode: editorial_workflow
collections:
  [
    {
      label: "Repeated Content Blocks",
      name: "generalAreas",
      i18n: true,
      files:
        [
          {
            name: "media",
            label: "Media Channels",
            file: "src/_data/channels.json",
            i18n: true,
            fields:
              [
                {
                  label: "Distribution",
                  name: "distribution",
                  widget: "list",
                  required: true,
                  allow_add: true,
                  i18n: true,
                  fields:
                    [
                      {
                        name: "channel",
                        label: "Channel",
                        widget: "string",
                        i18n: true,
                        required: true,
                      },
                    ],
                },
              ],
          },

        ],
    },
  ]