[gen_l10n] Localizations fail to generate with apostrophes or quotes in plural strings

## Steps to Reproduce

1. Create a plural string with quotes: `{count,plural, =1{Flutter's amazing, times 1!} other{Flutter's amazing, times {count}!}}`
2. Run the gen_l10n script
3. The generated output is not valid dart code

<details>
  <summary>Logs</summary>

<!--

```
[✓] Flutter (Channel master, v1.18.1-pre.5, on Mac OS X 10.15.4 19E266, locale en-DE)
    • Flutter version 1.18.1-pre.5 at /Users/perc/development/flutter
    • Framework revision ae497dca0a (3 minutes ago), 2020-04-07 12:33:25 +0200
    • Engine revision 49891e0653
    • Dart version 2.8.0 (build 2.8.0-dev.20.0 1210d27678)

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at /Users/perc/Library/Android/sdk
    • Platform android-stable, build-tools 29.0.2
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.3.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.3.1, Build version 11C505
    • CocoaPods version 1.8.4

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[!] Android Studio
    • Android Studio at /Applications/Android Studio with Blaze.app/Contents
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)

[✓] Android Studio (version 3.6)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 44.0.2
    • Dart plugin version 192.7761
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)

[!] VS Code (version 1.43.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    ✗ Flutter extension not installed; install from
      https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[✓] Connected device (4 available)
    • iPhone 11 Pro Max • 81158E5C-C27D-49D1-9FD9-55EE1011FEBF • ios            • com.apple.CoreSimulator.SimRuntime.iOS-13-3 (simulator)
    • macOS             • macOS                                • darwin-x64     • Mac OS X 10.15.4 19E266
    • Chrome            • chrome                               • web-javascript • Google Chrome 80.0.3987.149
    • Web Server        • web-server                           • web-javascript • Flutter Tools

```

</details>

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[gen_l10n] Localizations fail to generate with apostrophes or quotes in plural strings #54184

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[gen_l10n] Localizations fail to generate with apostrophes or quotes in plural strings #54184

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