Use the same key for "signin" and "signup" texts

We were using the same texts in several places

config/locales/en/budgets.yml

@@ -98,8 +98,6 @@ en:
           verify_account: "verify your account"
           create: "Create a budget investment"
           not_logged_in: "To create a new budget investment you must %{sign_in} or %{sign_up}."
-          sign_in: "sign in"
-          sign_up: "sign up"
           by_feasibility: By feasibility
           feasible: Feasible projects
           unfeasible: Unfeasible projects

config/locales/en/community.yml

@@ -17,8 +17,6 @@ en:
         first_theme_not_logged_in: No issue available, participate creating the first one.
         first_theme: Create the first community topic
         sub_first_theme: "To create a theme you must %{sign_in} or %{sign_up}."
-        sign_in: "sign in"
-        sign_up: "sign up"
       tab:
         participants: Participants
       sidebar:

config/locales/en/general.yml

@@ -665,8 +665,6 @@ en:
       back: Back to voting
       cant_answer_not_logged_in: "You must %{signin} or %{signup} to participate."
       comments_tab: Comments
-      signin: Sign in
-      signup: Sign up
       cant_answer_verify_html: "You must %{verify_link} in order to answer."
       verify_link: "verify your account"
       cant_answer_expired: "This poll has finished."
@@ -859,8 +857,9 @@ en:
       all: "You do not have permission to carry out the action '%{action}' on %{subject}."
   users:
     login_to_comment: "You must %{signin} or %{signup} to leave a comment."
-    signin: Sign in
-    signup: Sign up
+    login_to_continue: "You must %{signin} or %{signup} to continue."
+    signin: "sign in"
+    signup: "sign up"
     direct_messages:
       new:
         body_label: Message
@@ -870,9 +869,6 @@ en:
         title_label: Title
         verified_only: To send a private message %{verify_account}
         verify_account: verify your account
-        authenticate: You must %{signin} or %{signup} to continue.
-        signin: sign in
-        signup: sign up
       show:
         receiver: Message sent to %{receiver}
     show:
@@ -921,7 +917,6 @@ en:
     disagree: I disagree
     organizations: Organizations are not permitted to vote
     supports: Supports
-    unauthenticated: You must %{signin} or %{signup} to continue.
     verified_only: Only verified users can vote on proposals; %{verify_account}.
     verify_account: verify your account
     budget_investments:
@@ -1002,8 +997,6 @@ en:
     help:
       alt: Select the text you want to comment and press the button with the pencil.
       text: To comment this document you must %{sign_in} or %{sign_up}. Then select the text you want to comment and press the button with the pencil.
-      text_sign_in: login
-      text_sign_up: sign up
       title: How I can comment this document?
   links:
     form:

config/locales/en/legislation.yml

@@ -113,8 +113,6 @@ en:
       participation:
         phase_not_open: This phase is not open
         organizations: Organisations are not permitted to participate in the debate
-        signin: Sign in
-        signup: Sign up
         unauthenticated: You must %{signin} or %{signup} to participate.
         verified_only: Only verified users can participate, %{verify_account}.
         verify_account: verify your account

config/locales/es/budgets.yml

@@ -98,8 +98,6 @@ es:
           verify_account: "verifica tu cuenta"
           create: "Crear proyecto de gasto"
           not_logged_in: "Para crear un nuevo proyecto de gasto debes %{sign_in} o %{sign_up}."
-          sign_in: "iniciar sesión"
-          sign_up: "registrarte"
           by_feasibility: Por viabilidad
           feasible: Ver los proyectos viables
           unfeasible: Ver los proyectos inviables

config/locales/es/community.yml

@@ -17,8 +17,6 @@ es:
         first_theme_not_logged_in: No hay ningún tema disponible, participa creando el primero.
         first_theme: Crea el primer tema de la comunidad
         sub_first_theme: "Para crear un tema debes %{sign_in} o %{sign_up}."
-        sign_in: "iniciar sesión"
-        sign_up: "registrarte"
       tab:
         participants: Participantes
       sidebar:

config/locales/es/general.yml

@@ -663,8 +663,6 @@ es:
       back: Volver a votaciones
       cant_answer_not_logged_in: "Necesitas %{signin} o %{signup} para participar."
       comments_tab: Comentarios
-      signin: iniciar sesión
-      signup: registrarte
       cant_answer_verify_html: "Por favor %{verify_link} para poder responder."
       verify_link: "verifica tu cuenta"
       cant_answer_expired: "Esta votación ha terminado."
@@ -856,8 +854,9 @@ es:
       all: "No tienes permiso para realizar la acción '%{action}' sobre %{subject}."
   users:
     login_to_comment: "Necesitas %{signin} o %{signup} para comentar."
-    signin: iniciar sesión
-    signup: registrarte
+    login_to_continue: "Necesitas %{signin} o %{signup} para continuar."
+    signin: "iniciar sesión"
+    signup: "registrarte"
     direct_messages:
       new:
         body_label: Mensaje
@@ -867,9 +866,6 @@ es:
         title_label: Título
         verified_only: Para enviar un mensaje privado %{verify_account}
         verify_account: verifica tu cuenta
-        authenticate: Necesitas %{signin} o %{signup}.
-        signin: iniciar sesión
-        signup: registrarte
       show:
         receiver: Mensaje enviado a %{receiver}
     show:
@@ -918,7 +914,6 @@ es:
     disagree: No estoy de acuerdo
     organizations: Las organizaciones no pueden votar.
     supports: Apoyos
-    unauthenticated: Necesitas %{signin} o %{signup} para continuar.
     verified_only: Las propuestas sólo pueden ser votadas por usuarios verificados, %{verify_account}.
     verify_account: verifica tu cuenta
     budget_investments:

config/locales/es/legislation.yml

@@ -112,8 +112,6 @@ es:
       participation:
         phase_not_open: Esta fase no está abierta
         organizations: Las organizaciones no pueden participar en el debate
-        signin: iniciar sesión
-        signup: registrarte
         unauthenticated: Necesitas %{signin} o %{signup} para participar en el debate.
         verified_only: Solo los usuarios verificados pueden participar en el debate, %{verify_account}.
         verify_account: verifica tu cuenta