[docs] Spanish translate chat_templating.md & yml addition
Author: njackman-2344
Pull request: yes

# What does this PR do?
Translates chat_templating.md to Spanish and _toctree.yml addition to include local and title 
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Fixes # docs (can input new issue since last one was merged)


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Comments:
Thank you @aaronjimv @stevhliu !!

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