Translation to Portuguese-Brazil

Hi there 👋

Let's translate the course to `pt-BR` so that the whole community can benefit from this resource 🌎!

Below are the chapters and files that need translating - let us know here if you'd like to translate any and we'll add your name to the list. Once you're finished, open a pull request and tag this issue by including `#issue-number` in the description, where `issue-number` is the number of this issue.

> 🙋 If you'd like others to help you with the translation, you can also post in our [forums](https://discuss.huggingface.co/c/course/20) or tag [@_lewtun](https://twitter.com/_lewtun) on Twitter to gain some visibility.

## Chapters

** TOC **
- [x] [`_toctree.yml`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/_toctree.yml)

**Unit 0 - Welcome to the course!**
- [x] [`introduction.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter0/introduction.mdx)
- [x] [`get_ready.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter0/get_ready.mdx)
- [x] [`community.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter0/community.mdx)

**Unit 1 - Working with audio data**
- [x] [`introduction.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter1/introduction.mdx)
- [x] [`audio_data.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter1/audio_data.mdx)
- [x] [`load_and_explore.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter1/load_and_explore.mdx)
- [x] [`preprocessing.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter1/preprocessing.mdx)
- [x] [`streaming.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter1/streaming.mdx)
- [x] [`quiz.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter1/quiz.mdx)
- [x] [`supplemental_reading.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter1/supplemental_reading.mdx)

**Unit 2 - A gentle introduction to audio applications**
- [ ] [`introduction.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter2/introduction.mdx)
- [ ] [`audio_classification_pipeline.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter2/audio_classification_pipeline.mdx)
- [ ] [`asr_pipeline.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter2/asr_pipeline.mdx)
- [ ] [`tts_pipeline.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter2/tts_pipeline.mdx)
- [ ] [`hands_on.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter2/hands_on.mdx)

**Unit 3 - Transformer architectures for audio**
- [ ] [`introduction.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter3/introduction.mdx)
- [ ] [`ctc.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter3/ctc.mdx)
- [ ] [`seq2seq.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter3/seq2seq.mdx)
- [ ] [`classification.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter3/classification.mdx)
- [ ] [`quiz.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter3/quiz.mdx)
- [ ] [`supplemental_reading.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter3/supplemental_reading.mdx)

**Unit 4 - Build a music genre classifier**
- [ ] [`introduction.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter4/introduction.mdx)
- [ ] [`classification_models.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter4/classification_models.mdx)
- [ ] [`fine-tuning.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter4/fine-tuning.mdx)
- [ ] [`demo.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter4/demo.mdx)
- [ ] [`hands_on.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter4/hands_on.mdx)

**Unit 5 - Automatic Speech Recognition**
- [ ] [`introduction

.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter5/introduction.mdx)
- [ ] [`asr_models.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter5/asr_models.mdx)
- [ ] [`choosing_dataset.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter5/choosing_dataset.mdx)
- [ ] [`evaluation.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter5/evaluation.mdx)
- [ ] [`fine-tuning.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter5/fine-tuning.mdx)
- [ ] [`demo.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter5/demo.mdx)
- [ ] [`hands_on.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter5/hands_on.mdx)
- [ ] [`supplemental_reading.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter5/supplemental_reading.mdx)

**Unit 6 - From text to speech**
- [ ] [`introduction.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter6/introduction.mdx)
- [ ] [`tts_datasets.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter6/tts_datasets.mdx)
- [ ] [`pre-trained_models.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter6/pre-trained_models.mdx)
- [ ] [`fine-tuning.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter6/fine-tuning.mdx)
- [ ] [`evaluation.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter6/evaluation.mdx)
- [ ] [`hands_on.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter6/hands_on.mdx)
- [ ] [`supplemental_reading.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter6/supplemental_reading.mdx)

**Unit 7 - Putting it all together**
- [ ] [`introduction.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter7/introduction.mdx)
- [ ] [`speech-to-speech.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter7/speech-to-speech.mdx)
- [ ] [`voice-assistant.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter7/voice-assistant.mdx)
- [ ] [`transcribe-meeting.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter7/transcribe-meeting.mdx)
- [ ] [`hands_on.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter7/hands_on.mdx)
- [ ] [`supplemental_reading.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter7/supplemental_reading.mdx)

**Unit 8 - Finish line**
- [ ] [`introduction.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter8/introduction.mdx)
- [ ] [`certification.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/chapter8/certification.mdx)

**Course Events**
- [ ] [`introduction.mdx`](https://github.com/rrg92/audio-transformers-course/blob/main/chapters/pt-BR/events/introduction.mdx)

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Start with the unchecked MDX files under chapters/pt-BR, using the completed Unit 0 and Unit 1 translations as references for terminology and structure. Translate the remaining chapters and Course Events files, update the checklist as work is completed, and open a pull request that references issue #173.

Written by the indexing model from the issue text.