It is true that Flow by default allows anyone to hide (flow-hide right) a comment.

The corresponding history text in French is:

"flow-rev-message-hid-post": "$1 {{GENDER:$2|a masqué}} un [$4 commentaire] sur « $6 » (<em>$5</em>)..",

However, anyone can also see a hidden post.

There are also separate actions/right (flow-delete, and flow-suppress).

Only users with flow-delete (typically admins) can see deleted content, and only users with flow-suppress can see suppressed/oversighted content.

That topic history doesn't show any hidden posts AFAICT, only one deleted one, so it's not testing this.

Note, there is another significant issue. French is using the same text for hidden and suppressed, when they are very different:

	"flow-rev-message-hid-post": "$1 {{GENDER:$2|a masqué}} un [$4 commentaire] sur « $6 » (<em>$5</em>)..",
	"flow-rev-message-suppressed-post": "$1 {{GENDER:$2|a masqué}} un [$4 commentaire] sur « $6 » (<em>$5</em>)..",

This needs to be fixed.

Masquer is apparently the term used for oversight (AFAICT, since https://fr.wikipedia.org/wiki/Wikip%C3%A9dia:Masqueur_de_modifications is linked to https://en.wikipedia.org/wiki/Wikipedia:Oversight and mentions oversighter).

So a new term needs to be invented for hidden. Basically, this is something anyone can do or undo, analogous to blanking text (without actually deleting anything) on an old talk page.

In T111778#1618653, @Mattflaschen wrote:

However, anyone can also see a hidden post.

Tests I've practiced show the contrary :)

Masquer is apparently the term used for oversight (AFAICT, since https://fr.wikipedia.org/wiki/Wikip%C3%A9dia:Masqueur_de_modifications is linked to https://en.wikipedia.org/wiki/Wikipedia:Oversight and mentions oversighter).
So a new term needs to be invented for hidden. Basically, this is something anyone can do or undo, analogous to blanking text (without actually deleting anything) on an old talk page.

Yes, "Masquer" (mask) is the term for oversights actions.

"Cacher" (hide) is more accurate and can be changed on TranslateWiki.

In T111778#1619853, @Trizek-WMF wrote:

In T111778#1618653, @Mattflaschen wrote:

However, anyone can also see a hidden post.

Tests I've practiced show the contrary :)

Please link to an example.

In my testing it works.

For example, see https://www.mediawiki.org/wiki/Topic:Solwvj9uib3bpdoh . I hid the initial post of the topic.

However, if you go to topic history (https://www.mediawiki.org/w/index.php?title=Topic:Solwvj9uib3bpdoh&action=history), you can just click commented and then see it.

Just like blanking wikitext, it's not accessible by default (it is hidden, after all), but it's in the history.

"Cacher" (hide) is more accurate and can be changed on TranslateWiki.

Could you do this? If not, we can ask a volunteer.

There are several messages (including this one) involving hide or hidden. See en.json. flow-board-collapse-description is just a temporary visual collapse; it does not affect the actual content, or other users' viewing preferences. Same for flow-hide-comments-title .

On this conversation, I was not able to see the hidden contents. Appears it works.

Translation is already accurate on the interface. I haven't been attentive, sorry.

In T111778#1624235, @Trizek-WMF wrote:

Translation is already accurate on the interface. I haven't been attentive, sorry.

It still uses masquer.

Updated on TranslateWiki. Thanks a lot for your patience, @Mattflaschen!

In T111778#1625531, @Trizek-WMF wrote:

Updated on TranslateWiki. Thanks a lot for your patience, @Mattflaschen!

Maybe we could discuss this on IRC?

I'm online.