Feature Request
Describe your use case and the problem you are facing
There's already --update-mo-files, but since the .l10n.php files are the new default, they should be supported this way as well.
Describe the solution you'd like
A clear and concise description of what you want to happen. Add any considered drawbacks if you can think of any.
New update-php-files flag that updates .l10n.php files.