Add to Tags the ability to chose 2+ languages in a different way we select the game tags (separate field) .
For 2/3 language known streamers the ability to select only the main language is kind of poor

It would help a lot to people who are from another countries and speak two languages to be able to show their native language and their secondary language to be discover by more people.

I suggest you add a multilingual tag for streams to use instead of adding several language tags to their stream. It's really annoying trying to filter streams to a certain language (in my case english) and you still get streams that speak in other languages, because they tag their stream as english even though they only speak english 10% of the time.

I would like this system very much.

A large amount of people who can speak more than one language are active streamers. These people tend to put in their title that they can speak these languages, but these streams do not show up when the average user uses the language filter to find a stream to watch.

My idea is to have a second selection under the language drop down menu titled "additional languages" so that the streamer can select any or all of the languages that are relevant to them, thus allowing them to be found with the language filters active.

Hi guys, this is probably a purely subjective case that I present, but at the same time I'm sure I'm not the only bilingual streamer out there.
So, I decided to try and bring together a logical post about how and why allowing streamers to be listed in two different languages is helpful to those streamers.

First: The Problem.
Streaming in one language and one language only is restrictive to bilingual streamers. People who want to increase their audience are forced to choose only one language, and viewers can't discover them.
Here's an example of what I'm talking about by browsing the overwatch section, in Chinese and once more, in English. Let's use a bilingual streamer that speaks both Chinese and English as an example. That streamer is forced to be listed in one language's directory or another. The streamer cannot be listed in both language's directories.
Second: Being discovered.
I streamed in English today for the first time. Let's compare this to the day before where I streamed in Chinese.
Today's stream (listed in English directory) - https://imgur.com/h6RnN8e
Stream from Wednesday (listed in Chinese directory) - https://imgur.com/jCnMGSA
For both of these streams, I was physically at Computex - a trade show that is comparable to Consumer Electronics Show, but this takes place every summer in Taipei. These two screenshots conclusively display that when I stream in English, I have less viewers, when I stream in Chinese, I get more. But maybe half of my viewers come from the browse page.
The solution: Allow users to list themselves in a maximum of two language directories on Twitch. The reason why I am against using more than two language tags for a streaming session is because this could be abused to be listed in pretty much every language section.
If a streamer is lying about being bilingual and enough reports flow in, then I suggest that the community managers of a region be able to take away their bilingual tags.
Finally, how do we define "bilingual"? I have an undergraduate degree in Chinese language and literature and I speak a little Korean, but I wouldn't call myself "functional" in Korean, but of course I wouldn't be against a sort of "closed beta" program where twitch admins allow users to individually apply for bilingual streamer permissions. Faker would qualify, ToyZ would qualify, S1mple and a lot of CS:GO streamers would qualify for this. I guess it would be logical for Twitch as a website to restrict bilingual listings to only affiliates and partners for the time being. This would theoretically limit abuse of the system by limiting this to a smaller pool of streamers.

Example: I am Dutch and want to talk in Dutch & English on stream.
Please add an ability to pick 2 languages instead of one so i people can find me in both languages

I hope to Streaming by 2 and more languages.

but Twitch just only can choose one language for streaming.

how about make a multi-language streaming system

for global users?

Lots of streamers are speaking more than one language. They have to put sth like [ENG/FR] or whatever in their title. Unfortunately you are only able to choose one language which makes filtering/being found by viewers through filtering much more difficult than it has to be. I don't think that is a hard feature to add and it would make the twitch experience much more enjoyable for so many people - streamers and viewers alike =)