Description

When using the l10n tool, the following issue has surfaced:

Arb file:

  "rallyLoginNoAccount": "Het jy nie 'n rekening nie?",

Generated getter:

  @override
  String get rallyLoginNoAccount => 'Het jy nie 'n rekening nie?'; // causes error

This PR introduced proper escaping of quote characters. There was also a small change to the stocks app example to make sure to use en.arb as the template instead of en_US.arb

Related Issues

Fixes #51787

Tests

I added the following tests:

• Additions to the integration test ensuring that double and single quote characters are properly generated by the tool.

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.
• 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.
• 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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  • I wrote a migration guide: Replace with a link to your migration guide