[docs] Spanish translation of tasks_explained.md (#29224)
* Add tasks_explained.md to es/
* Fix little typo in en/ version
* translate speach/audio section
* translate part of vision computer section | fix little typo in en/
* Fix little typo in en/
* Translate vision computer section | remove ** ** to * * in both files
* Translate NLP section | fix link to task/translation in en/
* Updete link in es/tasks_summary.md
* Fix task_summary title link
