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1. No, you cannot do that. That's not how Joomla's multi-language feature works. You can have one language per category or have a category that's displayed in all languages. In the latter case the title and description is common for everyone. Frankly, the "All" language option is made for use by single-language sites.

What you are looking for seems to be a translated site, not a multi-language site. This is not possible with the Joomla core. There are third party extensions, like Falang, but please bear in mind that we do not support them.

2. Emails are sent in the user's preferred language per their user profile. If it's not set or an email template is not set up for this language, emails are sent in the site's default language. If that's not set or an email template is not set up for this language either we fall back to English (Great Britain). Finally, if all else fails, we will use the All language email template.

If you make developments in that direction in the future, it would be great being able to associate categories across languages if possible, and to have the possibility to list all the tickets , whatever their language, into the page visited by the user. (not to translate the content of the tickets, only to list them).

There are two mutually exclusive ideas in there, neither of which would work for your.

Idea 1: Language associations. This is how Joomla does it for articles, menu items etc. We are not going to implement this. This can already be done with a hidden menu and menu item associations. Since this is a very standard method for building Joomla sites we don't even need to document it.

Idea 2: Display items from multiple categories on a single category's page. This is not going to happen EVER. It is a horrible idea on UX, performance, security and architectural level.

The performance is abysmal. Searching for a single category is an optimal operation for MySQL. It uses an index in a way that makes it super fast. Start adding categories and things gets wonky. In some queries it will not even use the index because it determines it's faster to just go through the entire dataset.

From a UX perspective this idea is a mess.  No pagination, no searching, no filtering by status, no SEF URLs, no New Ticket button and the list goes on.

Each category has its own view level and permissions. Trying to merge them creates a major issue. What is the effective view level and permissions of the union? There is no universal way to determine that. Any implementation will lead to several cases where people see content they shouldn't or are able to file or administer tickets when they shouldn't. It's conceivable that because of the complexity of the code this would introduce a vulnerability which would allow an attacker to covertly exfiltrate private information.

As for architecture, this adds a level of complexity that permeates the entire component. For marginal gains we are introducing a slew of conditionals and ungodly tricks which will make the code far harder to maintain and introduce bugs.

In so many words, no, I am not going to do it. I know better than to make this kind of colossal mistake.

I figured you were thinking about a pre-sales contact page. My dev site is actually set up as a small software business site, complete with multilingual and pre-sales categories in Greek and English. I did think about the same thing you are thinking about now – I did build that site as if I was building a real site. Here's my thinking.

A primarily Greek speaking user is likely to be able to read English as well. A primarily English speaking user is unlikely to be able to read Greek. Mixing the two would be a disservice to the English speaking user. Moreover, the whole concept of Joomla being multi-language is that a user selects which language they want to use the site with. It doesn't make sense mixing different languages. If that was the case we would have single language sites like it's Joomla 1.5 all over again.

So, the best approach that makes sense to your clients is having separate categories for French and English. The French speakers who also speak English can switch between languages to browse international tickets. The English-only speakers will not have to be exposed to a language they don't speak and which if they saw they'd be confused and unlikely to return to your site (which is a big part of why we ask people to only post tickets on our site in English despite me speaking Greek and Davide speaking Italian natively).