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<!-- start_original_pr_link -->
Reverts: flutter#181685
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<!-- start_initiating_author -->
Initiated by: flar
<!-- end_initiating_author -->
<!-- start_revert_reason -->
Reason for reverting: breaks l10n tests in the tree
<!-- end_revert_reason -->
<!-- start_original_pr_author -->
Original PR Author: QuncCccccc
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Fixes: flutter#182181

<!-- start_reviewers -->
Reviewed By: {Piinks}
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<!-- start_revert_body -->
This change reverts the following previous change:
This PR is to update date localization. The update introduced NBSP to
connect time and its period(am or pm), so some invisible breakages are
expected.

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

<!-- end_revert_body -->

Co-authored-by: auto-submit[bot] <[email protected]>