Script to generate missing localization resources

[darrenaustin]

Description

This PR adds a new script that updates the language locale arb files with any missing resource entries that are included in the english arb files. This is useful when adding new resources for localization. You can just add the appropriate entries to the english arb file and then run this script. It will then check all of the other language locale arb files and update them with new 'TBD' entries for any missing resources. These will be picked up by the localization team and then translated.

Usage

Run this program from the root of the git repository.

dart dev/tools/localization/bin/gen_missing_localizations.dart

See lib/src/material/material_localizations.dart for more info on the process to add new localizations for the Flutter framework.

Checklist

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• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I signed the CLA.
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• I read the Tree Hygiene wiki page, which explains my responsibilities.
• I updated/added relevant documentation (doc comments with ///).
• All existing and new tests are passing.
• The analyzer (flutter analyze --flutter-repo) does not report any problems on my PR.
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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.

[fluttergithubbot]

It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption to this rule, contact Hixie.

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing.

[gspencergoog]

[fluttergithubbot]

This pull request is not suitable for automatic merging in its current state.

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