Following redalastor' idea, we can make a plan step by step to gt to that ideal (or at least a similar one) :

Considering snaps are belong to the users who posted them, they don't have such big links to the tribes they appear in.
Considering also that it's the individual users who have the ability, or not, to understand certain languages, and the will, or not, to hide the languages they don't understand.

1. We already have the possibility to assign tags to snaps, so we can start by tagging every snap that is not in English with the English name of the language(s) in which they are (I've put an 's' there because there could be a video with 2, 3 or more languages spoken in it, for example). It's important that this is standard for the next steps. I don't know Snapzu well enough yet to know exactly wht we can and can't do with a snap's tags (can we filter it in any way? can we search for it?)

2. The first thing that will need to be coded by Snapzu's admins, is the possibility to formally identify a snap's language(s). They could use the tags as the default value when rolling out the feature, with English only being assigned if no other language name is found within the tags. When the feature is out, the language setting of new snaps becomes mandatory, with English only selected by default (for now).

3. I'd actually put this step at the same time as the previous one, but it's not absolutely required. We then build a simple filter system where we could show or hide content in one language throughout the site (a per user setting).
4. To simplify everyone's lives, we allow each user, hrough their settings, to select the languages they understand, with one main or default language. We could then allow them to automatically filter all content based on this setting, I'd still put a check box asking if they want to activate this filter or not (some people might want to aee all content from the people they follow, even if they don't understand it). And, we'd put these languages first in the list of languages they can choose for their new snaps, with the one they have as main selected by default, so most of the time, the right language is selected for their snaps.
5. Then, we can do the same with tribes, and put a checkbox in the tribe's settings to indicate if we allow content in languages that aren't selected or not.

The beauty of it is that it can be implemented step by step, and it works all the way. We don't have to make one giant update with all the features. And we have the time to test everything and reconsider between each step if the idea was good or not, so we can ajust each subsequent step.

Now, for text posts. For now they belong to a tribe, but it seems they will be treated the same way as snaps in the next update, so we can aply the same logic as the snaps.

Snapzu ne supporte pas bien le contenu dans des langues autres que l'anglais.

Pour l'instant, seuls les snap avec des liens sont impactés, on peut donc toujours publier des discussion sans se faire embêter.

Les administrateur travaillent à une solution. Pour plus d'information, vous pouvez lire ce fil dans la tribu /t/lounge (en anglais).

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For the moment, only snaps with links are affected, we can still create discussions in French (or any other languages) without being hassled.

The admins are aware of the situation and are working on improving this issue. For more information, you can read this thread on the /t/lounge tribe.