diff --git a/config/locales/en/activerecord.yml b/config/locales/en/activerecord.yml
index 6f5328b67..94b8b3d73 100644
--- a/config/locales/en/activerecord.yml
+++ b/config/locales/en/activerecord.yml
@@ -37,6 +37,9 @@ en:
       manager:
         one: "Manager"
         other: "Managers"
+      newsletter:
+        one: "Newsletter"
+        other: "Newsletters"
       vote:
         one: "Vote"
         other: "Votes"
@@ -234,6 +237,11 @@ en:
       poll/question/answer/video:
         title: Title
         url: External video
+      newsletter:
+        segment_recipient: Recipients
+        subject: Subject
+        from: From
+        body: Email content
     errors:
       models:
         user:
diff --git a/config/locales/en/admin.yml b/config/locales/en/admin.yml
index 2e0f6ff22..dfa7d768c 100644
--- a/config/locales/en/admin.yml
+++ b/config/locales/en/admin.yml
@@ -465,7 +465,8 @@ en:
       administrators: Administrators
       managers: Managers
       moderators: Moderators
-      newsletter: Newsletters
+      emails: Sending of emails
+      newsletters: Newsletters
       valuators: Valuators
       poll_officers: Poll officers
       polls: Polls
@@ -514,10 +515,45 @@ en:
         delete: Delete
       search:
         title: 'Moderators: User search'
+    segment_recipient:
+      all_users: All users
+      proposal_authors: Proposal authors
+      investment_authors: Investment authors in the current budget
+      feasible_and_undecided_investment_authors: Authors of feasible or undecided investments in the current budget
+      selected_investment_authors: Authors of selected investments in the current budget
+      winner_investment_authors: Authors of winner investments in the current budget
     newsletters:
+      create_success: Newsletter created successfully
+      update_success: Newsletter updated successfully
+      send_success: Newsletter sent successfully
+      delete_success: Newsletter deleted successfully
       index:
         title: Newsletters
-        button: Download zip with users list
+        new_newsletter: New newsletter
+        subject: Subject
+        segment_recipient: Recipients
+        sent: Sent
+        actions: Actions
+        draft: Draft
+        edit: Edit
+        delete: Delete
+        preview: Preview
+        empty_newsletters: There are no newsletters to show
+      new:
+        title: New newsletter
+      edit:
+        title: Edit newsletter
+      show:
+        title: Newsletter preview
+        send: Send
+        affected_users: (%{n} affected users)
+        sent_at: Sent at
+        subject: Subject
+        segment_recipient: Recipients
+        from: From
+        body: Email content
+        body_help_text: This is how the users will see the email
+        send_alert: Are you sure you want to send this newsletter to %{n} users?
     valuators:
       index:
         title: Valuators
diff --git a/config/locales/es/activerecord.yml b/config/locales/es/activerecord.yml
index 92a996a86..564676f23 100644
--- a/config/locales/es/activerecord.yml
+++ b/config/locales/es/activerecord.yml
@@ -37,6 +37,9 @@ es:
       manager:
         one: "Gestor"
         other: "Gestores"
+      newsletter:
+        one: "Newsletter"
+        other: "Newsletters"
       vote:
         one: "Voto"
         other: "Votos"
@@ -230,6 +233,11 @@ es:
       poll/question/answer/video:
         title: Título
         url: Vídeo externo
+      newsletter:
+        segment_recipient: Destinatarios
+        subject: Asunto
+        from: Enviado por
+        body: Contenido del email
     errors:
       models:
         user:
diff --git a/config/locales/es/admin.yml b/config/locales/es/admin.yml
index 463dedd99..455dae8dd 100644
--- a/config/locales/es/admin.yml
+++ b/config/locales/es/admin.yml
@@ -464,7 +464,8 @@ es:
       administrators: Administradores
       managers: Gestores
       moderators: Moderadores
-      newsletter: Envío de Newsletters
+      emails: Envío de emails
+      newsletters: Newsletters
       valuators: Evaluadores
       poll_officers: Presidentes de mesa
       polls: Votaciones
@@ -513,10 +514,45 @@ es:
         delete: Borrar
       search:
         title: 'Moderadores: Búsqueda de usuarios'
+    segment_recipient:
+      all_users: Todos los usuarios
+      proposal_authors: Usuarios autores de propuestas
+      investment_authors: Usuarios autores de proyectos de gasto en los actuales presupuestos
+      feasible_and_undecided_investment_authors: Usuarios autores de proyectos de gasto viables o sin decidir en los actuales presupuestos
+      selected_investment_authors: Usuarios autores de proyectos de gasto seleccionadas en los actuales presupuestos
+      winner_investment_authors: Usuarios autores de proyectos de gasto ganadoras en los actuales presupuestos
     newsletters:
+      create_success: Newsletter creada correctamente
+      update_success: Newsletter actualizada correctamente
+      send_success: Newsletter enviada correctamente
+      delete_success: Newsletter borrada correctamente
       index:
         title: Envío de newsletters
-        button: Descargar zip con lista de usuarios
+        new_newsletter: Crear newsletter
+        subject: Asunto
+        segment_recipient: Destinatarios
+        sent: Enviado
+        actions: Acciones
+        draft: Borrador
+        edit: Editar
+        delete: Borrar
+        preview: Previsualizar
+        empty_newsletters: No hay newsletters para mostrar
+      new:
+        title: Nueva newsletter
+      edit:
+        title: Editar newsletter
+      show:
+        title: Vista previa de newsletter
+        send: Enviar
+        affected_users: (%{n} usuarios afectados)
+        sent_at: Enviado
+        subject: Asunto
+        segment_recipient: Destinatarios
+        from: Enviado por
+        body: Contenido del email
+        body_help_text: Así es como verán el email los usuarios
+        send_alert: ¿Estás seguro/a de que quieres enviar esta newsletter a %{n} usuarios?
     valuators:
       index:
         title: Evaluadores