Description

The new redesign of the Material Time Picker (#59191) added several new user facing strings that need to be localized. This PR is the first step for that localization. It adds the new strings to the MaterialLocalizations class with english defaults in the DefaultMaterialLocalizations class. The locale .arb files have all been update with the english values for these strings. When the translations are available another PR will be created to complete the process.

Tests

I added the following tests:

• Tests for all the new strings to localizations_test.dart

Checklist

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• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I signed the CLA.
• I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
• I read the Tree Hygiene wiki page, which explains my responsibilities.
• The analyzer (flutter analyze --flutter-repo) does not report any problems on my PR.
• I updated/added relevant documentation (doc comments with ///).
• All existing and new tests are passing.
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

Did any tests fail when you ran them? Please read Handling breaking changes.

• No, no existing tests failed, so this is not a breaking change.
• Yes, this is a breaking change. If not, delete the remainder of this section.
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