Add text domain to solve Jed localization error

[IreneStr]

Summary

This PR can be summarized in the following changelog entry:

• N/A

Relevant technical choices:

N/A

Test instructions

This PR can be tested by following these steps:

• Use Gutenberg master.
• Checkout hotfix/8.3.1
• Open a post in the classic editor. See the error from the issue.
• Checkout this branch.
• Open a post in the classic editor. Open your console. See that the error is gone.

Quality assurance

• I have tested this code to the best of my abilities
• I have added unittests to verify the code works as intended

Fixes #11113

[afercia]

Note: this was also fixed in the pending ESLint PR #11099

[afercia]

Needs decision as #11099 is already in needs acceptance and already fixes this missing textdomain.

[IreneStr]

@afercia Since the eslint PR is based on trunk and we need this for the hotfix, please merge this one (and remove the fix from the eslint PR).

[afercia]

OK thanks

(and remove the fix from the eslint PR).

ok, will do before merge to solve the merge conflict

[afercia]

CR and acceptance 👍