Missing translations to Spanish

[AgustinAlfieri]

The section "Discover" on the Dspace home page is missing Spanish translations for it's title and advanced search. Suggested translations:

• Discover = "Filtrar" (Since more than discovering something you're filtering items)
• Advanced Search = "Búsqueda Avanzada"

When logged as an administrator, on the admin side menu, the section "Notifications" misses it's translations as well. Suggested translations:

• Notifications = "Notificaciones"
• Quality Assurance = "Control de Calidad" or "Verificación de Calidad"
• Publication Claim = "Reclamos de Publicaciones"

Both the "New" and "Edit" sections for items, communities and collections miss the translation for the words community and collection. Here are some examples:

Both the "Collection Filter Report" page (https://sandbox.dspace.org/admin/reports/collections) and the "Metadata Query Report" (https://sandbox.dspace.org/admin/reports/queries) have no Spanish translation.

Steps to reproduce the bug:

• Log in as an administrator on https://sandbox.dspace.org
• Select Spanish as your Language

[alexandrevryghem]

@AgustinAlfieri: Regarding the missing translations in the edit community/collection/item popup, currently these can't be translated, but I created a fix for this in #2930. For the other keys there is a guide for how to contribute them here, but since I already have an open PR so I can contribute those there if you want. And regarding your first suggestion I think that it should remain Discover in English since you can't actually filter anything with those facets, instead those facets will automatically redirect you to the /search page

[Andrea-Guevara]

Good afternoon @tdonohue! I'm part of the company Neki-it, and we'd like to contribute to this activity with the following PR: https://github.com/DSpace/dspace-angular/pull/3192

We look forward to your feedback!