Fix minor localization issues in Spanish: (#6094)

* Fix minor localization issues in Spanish:

- Use 'pack de inicio' instead of 'paquete de inicio'
- Use 'Inténtalo' instead of 'Intenta'
- Fix 'Por favor'
- Do not use 'una' as article for 'posts'
- Use 'Eliminado' instead of 'Removido'

* Update src/locale/locales/es/messages.po

Co-authored-by: oledfish <[email protected]>

* Use 'paquete de inicio' and fix typos

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Co-authored-by: oledfish <[email protected]>