Issue - The new BCD label is removed during a Fix flaws

Following the arrival of browser-compat in the meta part of the document, the replacement of the specifications and compatibility tables is correctly managed by Yari.

However, when we use Fix Flaws on a translated document, for which we have added this new property, the line is removed by Flaws. This results in a double error to indicate that Specification and Compat are not used correctly, and the obligation to rewrite the browser-compat: xxxx line at the top of the document.

Steps to reproduce:

1. Open a document with flaws error on links
2. Add browser-compat line
3. Fix flaws (On this screen, I’ve forced an typo error for the example)
4. See the head content of the page, the browser-compat is removed

[peterbe]

For the record, this bug is not related to translated content. It can happen to mdn/content too.

[tristantheb]

@peterbe @escattone

I added the screenshots of examples, as I’m correcting a large page at the moment, and it uses a compatibility table, I took the opportunity to make screenshots of the steps and the result 😃