That contribution is designed to be unzipped directly to your store's root folder and it will create button sets for your admin and your catalog ion the right places. However, since you don't speak Spanish, you may prefer to unzip it somewhere else and just upload the buttons for your catalog, in which case just follow the structure that unzipping will create.
Columbian and Mexican Spanish are fairly similar dialects of the same language. Of more significance is that this is referred to as "Informal" (as opposed to formal) Spanish. However, a quick scan of the button set did not turn up anything obviously inappropriate to my rudimentary Spanish. But to be safe I'd recommend consulting a native speaker of target dialect.
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