Support for spanish language

[Cegard]

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• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
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[aboullaite]

Thanks for your contribution @Cegard. Can you please fix conflicts!

[Cegard]

Conflicts were fixed again.

[Cegard]

Conflicts were fixed again.

[elinguiuriel]

@Cegard thank you so much, I love when someone adds a new language to the bot

[elinguiuriel]

@Cegard make sure your facebook language is spanish and test the chabot here https://m.me/OpenSourceChatbot

Pay attention to untranslated phrases that you can correct in a new PR :-) !

[Cegard]

Hi @elinguiuriel I'm glad to contribute to this project. I took a look at the untranslated text and I decided that the way to go with this was adding the msgid in the messages.po, but I'm not sure if this is the proper fix or just a workaround, What do you think?