Remove duplicated frontmatter keys from localized content

[queengooborg]

As pointed out by @yin1999, frontmatter metadata (ex. tags, title) is combined with the metadata from the original en-US docs. As such, keys such as tags, browser-compat, and spec-urls is redundant to copy to the localized content. These duplicated keys should be removed from the localized docs for easier maintenance overall. We should only keep: title, short_title, slug, original_slug and l10n.*.

Edit; July 18, 2023
A configuration file is now present in this repository, which will let us utilize the frontmatter linter in upstream content! To use the linter to fix the frontmatter, perform the following:

cd /path/to/mdn/content
yarn fix:fm --configFile /path/to/mdn/translated-content/front-matter-config.json --files /path/to/mdn/translated-content/files/<locale>

[SphinxKnight]

@queengooborg is there any "deadline" or something blocked by this or can we go progressively during "new" edits on pages?

Note to self: double-check HTMLRef (and maybe JS or CSS sidebar as I have a doubt about them not using localized pages' tags)

[queengooborg]

This can be done progressively and isn't blocking anything, so it can be done at our own leisure!

[queengooborg]

In another issue (#5618), @yin1999 pointed out that all frontmatter keys are merged with the en-US metadata. I've broadened the scope of this issue to include all redundant metadata!

[SphinxKnight]

Without testing, I'd go for removing translation_of, this key might be useful for dealing with orphaned/conflicting pages but does not contain any other info than the slug (in a yari world).

[yin1999]

Done for l10n-zh

[YujiSoftware]

I made a script to batch delete.
https://gist.github.com/YujiSoftware/bfa7aa0957d276c679f52d254baea6b1

ruby remove_frontmatter_keys.rb files\ja\webassembly

Remove anything but the meta below.

• title
• slug
• original_slug
• l10n.*
• i10n.*