Support explanation attribute for Android string resources about weblate

[nijel]

Have you tested that native Android tools (such as lint) won't have problems with additional attributes?

[nikclayton]

Yes. I've checked:

• Attributes with custom namespaces are ignored (but preserved) by the Translation Editor in Android Studio
• Android lint doesn't report any issues with additional attributes
• There are no errors or warnings when building an app with a string resource file that has attributes with a custom namespace

[nijel]

Sounds good, we're already supporting weblate-flags XML attribute (see https://docs.weblate.org/en/latest/formats.html#translation-flags), but using an XML namespace is definitely a better approach. There already is a repository with JSON schemas at https://github.com/WeblateOrg/weblate_schemas/, this could be added there.

[github-actions]

This issue has been added to the backlog. It is not scheduled on the Weblate roadmap, but it eventually might be implemented.

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