Overriding translations

My current and default app locale is "es_ES".

I generated my default.pot using I18n shell and my en_US translations in default.po and default.mo inside en_US folder.
es_ES doesn't have .po and .mo files at all, because the "native language" of the app strings is es_ES.

How can I override a translation in es_ES using I18n translators?

For example, a message like:

__('Hola')

I want to define a custom "array" translator so I can change this string into another:

$translator = ['Hola' => 'Adios'];

__('Adios')

Tried to follow the examples in the book without success.

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