Hello, CAF PROAMBIENTE!
Probably you forgot to select the Agama-Pro theme for the translation.
Make sure you exactly followed the next steps:
1. After you installed and activated your “Loco Translate” plugin, Navigate to Dashboard->Loco Translate
and click on the Agama Pro theme, Below the “Active Theme” title.
https://prnt.sc/phrpn2
2. On the next screen, click the “Edit ” link below the Spanish language.
https://prnt.sc/phrqq1
3.Copy the sentences you want to translate from your Contact Page and paste it into “Filter Translations” text field (e.g. Send us an Email)
https://prnt.sc/phru0r
4. Translate the text and Save the translation.
https://prnt.sc/phruk8
5. Refresh your Contact page. Now your text should be translated
https://prnt.sc/phrvh1
Also, you can check the articles from the following links:
https://spyropress.com/knowledgebase/use-loco-translate-plugin-theme-translation.html
https://youtu.be/3vj0k65DRhg?t=597
Hope this helps you.
Regards