[BUG]: Language selector issue on addition and subtraction - chapter 1 "what is addition?"

[Marina-fatima-oppia]

Describe the bug

Language selector is not visible on addition and subtraction - chapter 1 "what is addition?"

URL of the page where the issue is observed.

https://www.oppia.org/explore/OKxYhsWONHZV?story_url_fragment=maya-omar-malik-make-pizza&topic_url_fragment=addition-subtraction&classroom_url_fragment=math&node_id=node_1

Steps To Reproduce

1 - Open Addition and Subtraction lessons, chapter 1
2 - In the first page you don't see the language selector, so, you can't translated it.

Expected Behavior

Language selector should be visible, similar to the other pages.

Screenshots/Videos

What device are you using?

Desktop

Operating System

Windows

What browsers are you seeing the problem on?

Chrome

Browser version

No response

Additional context

No response

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[seanlip]

Note: This is happening because of missing translations in https://www.oppia.org/create/OKxYhsWONHZV#/translation/Introduction. Moving this to the lessons-team queue since translator action is needed (the fix is not technical).