diff --git a/Gemfile b/Gemfile
index a0e612360..d96ea4e03 100644
--- a/Gemfile
+++ b/Gemfile
@@ -51,6 +51,7 @@ group :development, :test do
   gem 'launchy'
   gem 'quiet_assets'
   gem 'letter_opener_web', '~> 1.2.0'
+  gem 'i18n-tasks'
 end
 
 group :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index e1390d4ab..bc4dd1e27 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -94,6 +94,10 @@ GEM
     docile (1.1.5)
     domain_name (0.5.24)
       unf (>= 0.0.5, < 1.0.0)
+    easy_translate (0.5.0)
+      json
+      thread
+      thread_safe
     erubis (2.7.0)
     execjs (2.5.2)
     factory_girl (4.5.0)
@@ -106,9 +110,18 @@ GEM
       sass (>= 3.3.0, < 3.5)
     globalid (0.3.5)
       activesupport (>= 4.1.0)
+    highline (1.7.3)
     http-cookie (1.0.2)
       domain_name (~> 0.5)
     i18n (0.7.0)
+    i18n-tasks (0.8.6)
+      activesupport
+      easy_translate (>= 0.5.0)
+      erubis
+      highline
+      i18n
+      term-ansicolor
+      terminal-table (>= 1.5.1)
     jbuilder (2.3.1)
       activesupport (>= 3.0.0, < 5)
       multi_json (~> 1.2)
@@ -221,7 +234,9 @@ GEM
       sprockets (>= 2.8, < 4.0)
     term-ansicolor (1.3.2)
       tins (~> 1.0)
+    terminal-table (1.5.2)
     thor (0.19.1)
+    thread (0.2.2)
     thread_safe (0.3.5)
     tilt (1.4.1)
     tins (1.5.4)
@@ -264,6 +279,7 @@ DEPENDENCIES
   devise
   factory_girl_rails
   foundation-rails
+  i18n-tasks
   jbuilder (~> 2.0)
   jquery-rails
   launchy
@@ -283,4 +299,4 @@ DEPENDENCIES
   web-console (~> 2.0)
 
 BUNDLED WITH
-   1.10.5
+   1.10.6
diff --git a/app/controllers/account_controller.rb b/app/controllers/account_controller.rb
index fa626ece9..494068476 100644
--- a/app/controllers/account_controller.rb
+++ b/app/controllers/account_controller.rb
@@ -17,7 +17,7 @@ class AccountController < ApplicationController
     end
 
     def account_params
-      params.require(:account).permit(:first_name, :last_name)
+      params.require(:account).permit(:first_name, :last_name, :nickname, :use_nickname)
     end
 
 end
diff --git a/app/controllers/registrations_controller.rb b/app/controllers/registrations_controller.rb
index c0113de42..4991cdf70 100644
--- a/app/controllers/registrations_controller.rb
+++ b/app/controllers/registrations_controller.rb
@@ -15,7 +15,7 @@ class RegistrationsController < Devise::RegistrationsController
   private
 
   def sign_up_params
-    params.require(:user).permit(:first_name, :last_name, :email, :password, :password_confirmation)
+    params.require(:user).permit(:first_name, :last_name, :email, :password, :password_confirmation, :use_nickname, :nickname)
   end
 
-end
\ No newline at end of file
+end
diff --git a/app/models/user.rb b/app/models/user.rb
index da1c3ab8d..2c0c2756b 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -2,7 +2,11 @@ class User < ActiveRecord::Base
   devise :database_authenticatable, :registerable, :confirmable,
          :recoverable, :rememberable, :trackable, :validatable
 
+  validates :first_name, presence: true, unless: :use_nickname?
+  validates :last_name, presence: true, unless: :use_nickname?
+  validates :nickname, presence: true, if: :use_nickname?
+
   def name
-    "#{first_name} #{last_name}"
+    use_nickname? ? nickname : "#{first_name} #{last_name}"
   end
 end
diff --git a/app/views/account/show.html.erb b/app/views/account/show.html.erb
index b3d45d967..da568a9b9 100644
--- a/app/views/account/show.html.erb
+++ b/app/views/account/show.html.erb
@@ -1,11 +1,20 @@
 <h1><%= t("account.show.title") %></h1>
 
 <%= form_for @account, as: :account, url: account_path do |f| %>
+
   <%= f.label :first_name, t("account.show.first_name_label") %>
   <%= f.text_field :first_name %>
   <%= f.label :last_name, t("account.show.last_name_label") %>
   <%= f.text_field :last_name %>
 
+  <div>
+  <%= f.check_box :use_nickname %>
+  <%= t("account.show.use_nickname_label") %>
+  </div>
+
+  <%= f.label :nickname, t("account.show.nickname_label") %>
+  <%= f.text_field :nickname %>
+
   <%= f.submit t("account.show.save_changes_submit"), class: "button radius" %>
 <% end %>
 
diff --git a/app/views/devise/registrations/new.html.erb b/app/views/devise/registrations/new.html.erb
index ebeae271b..c7cd839a2 100644
--- a/app/views/devise/registrations/new.html.erb
+++ b/app/views/devise/registrations/new.html.erb
@@ -21,6 +21,20 @@
                         </div>
                     </div>
 
+                    <div class="row">
+                        <div class="small-12 columns">
+                          <%= f.check_box :use_nickname %>
+                          <%= t("devise_views.registrations.new.use_nickname_label") %>
+                        </div>
+                    </div>
+
+                    <div class="row">
+                        <div class="small-12 columns">
+                            <%= f.label :nickname, t("devise_views.registrations.new.nickname_label") %>
+                            <%= f.text_field :nickname, placeholder: t("devise_views.registrations.new.nickname_label") %>
+                        </div>
+                    </div>
+
                     <div class="row">
                         <div class="small-12 columns">
                             <%= f.label :email, t("devise_views.registrations.new.email_label") %>
@@ -58,4 +72,4 @@
             </div>
         </div>
     </div>
-</div>
\ No newline at end of file
+</div>
diff --git a/config/application.rb b/config/application.rb
index 4055e45b6..cc325bc6c 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -20,6 +20,11 @@ module Participacion
     # config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]
     config.i18n.default_locale = :es
 
+    config.i18n.available_locales = [:en, :es]
+
+    # Add the new directories to the locales load path
+    config.i18n.load_path += Dir[Rails.root.join('config', 'locales', '**', '*.{rb,yml}')]
+
     config.assets.paths << Rails.root.join("app", "assets", "fonts")
 
     # Do not swallow errors in after_commit/after_rollback callbacks.
diff --git a/config/i18n-tasks.yml b/config/i18n-tasks.yml
new file mode 100644
index 000000000..f9b28d6a2
--- /dev/null
+++ b/config/i18n-tasks.yml
@@ -0,0 +1,106 @@
+# i18n-tasks finds and manages missing and unused translations: https://github.com/glebm/i18n-tasks
+
+# The "main" locale.
+base_locale: en
+## All available locales are inferred from the data by default. Alternatively, specify them explicitly:
+# locales: [es, fr]
+## Reporting locale, default: en. Available: en, ru.
+# internal_locale: en
+
+# Read and write translations.
+data:
+  ## Translations are read from the file system. Supported format: YAML, JSON.
+  ## Provide a custom adapter:
+  # adapter: I18n::Tasks::Data::FileSystem
+
+  # Locale files or `File.find` patterns where translations are read from:
+  read:
+    ## Default:
+    # - config/locales/%{locale}.yml
+    ## More files:
+    # - config/locales/**/*.%{locale}.yml
+    ## Another gem (replace %#= with %=):
+    # - "<%#= %x[bundle show vagrant].chomp %>/templates/locales/%{locale}.yml"
+    - config/locales/%{locale}.yml
+    - config/locales/devise_views.%{locale}.yml
+    - config/locales/responders.%{locale}.yml
+
+  # Locale files to write new keys to, based on a list of key pattern => file rules. Matched from top to bottom:
+  # `i18n-tasks normalize -p` will force move the keys according to these rules
+  write:
+    ## For example, write devise and simple form keys to their respective files:
+    # - ['{devise, simple_form}.*', 'config/locales/\1.%{locale}.yml']
+    ## Catch-all default:
+    # - config/locales/%{locale}.yml
+
+  ## Specify the router (see Readme for details). Valid values: conservative_router, pattern_router, or a custom class.
+  # router: convervative_router
+
+  yaml:
+    write:
+      # do not wrap lines at 80 characters
+      line_width: -1
+
+  ## Pretty-print JSON:
+  # json:
+  #   write:
+  #     indent: '  '
+  #     space: ' '
+  #     object_nl: "\n"
+  #     array_nl: "\n"
+
+# Find translate calls
+search:
+  ## Paths or `File.find` patterns to search in:
+  # paths:
+  #  - app/
+
+  ## Root directories for relative keys resolution.
+  # relative_roots:
+  #   - app/controllers
+  #   - app/helpers
+  #   - app/mailers
+  #   - app/presenters
+  #   - app/views
+
+  ## Files or `File.fnmatch` patterns to exclude from search. Some files are always excluded regardless of this setting:
+  ##   %w(*.jpg *.png *.gif *.svg *.ico *.eot *.otf *.ttf *.woff *.woff2 *.pdf *.css *.sass *.scss *.less *.yml *.json)
+  exclude:
+    - app/assets/images
+    - app/assets/fonts
+
+  ## Alternatively, the only files or `File.fnmatch patterns` to search in `paths`:
+  ## If specified, this settings takes priority over `exclude`, but `exclude` still applies.
+  # include: ["*.rb", "*.html.slim"]
+
+  ## Default scanner finds t() and I18n.t() calls.
+  # scanner: I18n::Tasks::Scanners::PatternWithScopeScanner
+
+## Google Translate
+# translation:
+#   # Get an API key and set billing info at https://code.google.com/apis/console to use Google Translate
+#   api_key: "AbC-dEf5"
+
+## Do not consider these keys missing:
+# ignore_missing:
+# - 'errors.messages.{accepted,blank,invalid,too_short,too_long}'
+# - '{devise,simple_form}.*'
+
+## Consider these keys used:
+# ignore_unused:
+# - 'activerecord.attributes.*'
+# - '{devise,kaminari,will_paginate}.*'
+# - 'simple_form.{yes,no}'
+# - 'simple_form.{placeholders,hints,labels}.*'
+# - 'simple_form.{error_notification,required}.:'
+
+## Exclude these keys from the `i18n-tasks eq-base' report:
+# ignore_eq_base:
+#   all:
+#     - common.ok
+#   fr,es:
+#     - common.brand
+
+## Ignore these keys completely:
+# ignore:
+#  - kaminari.*
diff --git a/config/initializers/i18n.rb b/config/initializers/i18n.rb
deleted file mode 100644
index 9aa77cd8b..000000000
--- a/config/initializers/i18n.rb
+++ /dev/null
@@ -1,6 +0,0 @@
-I18n.available_locales = [:en, :es]
-
-I18n.default_locale = :es
-
-# Add the new directories to the locales load path
-I18n.load_path += Dir[Rails.root.join('config', 'locales', '**', '*.{rb,yml}')]
diff --git a/config/locales/devise_views.en.yml b/config/locales/devise_views.en.yml
index d07d487ad..7675a204e 100644
--- a/config/locales/devise_views.en.yml
+++ b/config/locales/devise_views.en.yml
@@ -56,6 +56,8 @@ en:
         title: "Sign up"
         first_name_label: "First name"
         last_name_label: "Last name"
+        nickname_label: "Nickname"
+        use_nickname_label: "Use nickname"
         email_label: "Email"
         password_label: "Password"
         min_length: "(%{min} characters minimum)"
diff --git a/config/locales/devise_views.es.yml b/config/locales/devise_views.es.yml
index 1fa6fe880..63e3159e0 100644
--- a/config/locales/devise_views.es.yml
+++ b/config/locales/devise_views.es.yml
@@ -55,7 +55,9 @@ es:
       new:
         title: "Registrarse"
         first_name_label: "Nombre"
-        last_name_label: "Apellido"
+        last_name_label: "Apellidos"
+        nickname_label: "Pseudónimo"
+        use_nickname_label: "Usar pseudónimo"
         email_label: "Email"
         password_label: "Contraseña"
         min_length: "(mínimo %{min} caracteres)"
@@ -80,4 +82,4 @@ es:
         signin_with_provider: "Entrar con %{provider}"
         new_password: "¿Olvidaste tu contraseña?"
         new_confirmation: "¿No has recibido instrucciones para confirmar tu cuenta?"
-        new_unlock: "¿No has recibido instrucciones para desbloquear?"
\ No newline at end of file
+        new_unlock: "¿No has recibido instrucciones para desbloquear?"
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 2a8562a6e..7fdf7a214 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -20,9 +20,6 @@ en:
       votes: votes
       comment: Comment
       comments: Comments
-      agree: I agree
-      disagree: I disagree
-      leave_comment: Comment
     form:
       error: error
       errors: errors
@@ -48,7 +45,7 @@ en:
     new:
       publish_new: Publish new debate
       back_link: Back
-      recommendations_tite: Tips for creating a debate
+      recommendations_title: Tips for creating a debate
       recommendation_one: "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore"
       recommendation_two: "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore"
       recommendation_three: "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore"
@@ -61,12 +58,18 @@ en:
     agree: I agree
     disagree: I disagree
     supports: Supports
-    notice_thanks: "Thanks for voting."
-    notice_already_registered: "Your vote is already registered."
   account:
     show:
       title: "My account"
       save_changes_submit: "Save changes"
+      change_credentials_link: "Change my credentials"
+      first_name_label: "First Name"
+      last_name_label: "Last Name"
+      use_nickname_label: "Use nickname"
+      nickname_label: "Nickname"
+  recaptcha:
+    errors:
+      verification_failed: "The captcha verification failed"
   shared:
     tags_cloud:
         tags: Tags
diff --git a/config/locales/es.yml b/config/locales/es.yml
index d5869b284..9bbdde6b6 100644
--- a/config/locales/es.yml
+++ b/config/locales/es.yml
@@ -20,9 +20,6 @@ es:
       votes: votos
       comment: Comentario
       comments: Comentarios
-      agree: Estoy de acuerdo
-      disagree: No estoy de acuerdo
-      leave_comment: Comentar
     form:
       error: error
       errors: errores
@@ -61,12 +58,19 @@ es:
     agree: Estoy de acuerdo
     disagree: No estoy de acuerdo
     supports: Apoyos
-    notice_thanks: "Gracias por votar."
-    notice_already_registered: "Tu voto ya ha sido registrado."
   account:
     show:
       title: "Mi cuenta"
       save_changes_submit: "Guardar cambios"
+      change_credentials_link: "Cambiar mi contraseña"
+      first_name_label: "Nombre"
+      last_name_label: "Apellidos"
+      use_nickname_label: "Usar pseudónimo"
+      nickname_label: "Pseudónimo"
+  recaptcha:
+    errors:
+      verification_failed: "La verificación por captcha falló"
   shared:
     tags_cloud:
         tags: Etiquetas
+
diff --git a/config/locales/responders.en.yml b/config/locales/responders.en.yml
index cd0d93fe8..41c13a326 100644
--- a/config/locales/responders.en.yml
+++ b/config/locales/responders.en.yml
@@ -4,12 +4,12 @@ en:
       create:
         notice: '%{resource_name} was successfully created.'
         # alert: '%{resource_name} could not be created.'
-      update:
-        notice: '%{resource_name} was successfully updated.'
+      # update:
+        # notice: '%{resource_name} was successfully updated.'
         # alert: '%{resource_name} could not be updated.'
-      destroy:
-        notice: '%{resource_name} was successfully destroyed.'
-        alert: '%{resource_name} could not be destroyed.'
+      # destroy:
+        # notice: '%{resource_name} was successfully destroyed.'
+        # alert: '%{resource_name} could not be destroyed.'
       save_changes:
         notice: "Saved"
 
diff --git a/config/locales/responders.es.yml b/config/locales/responders.es.yml
index ad8012f9e..e11fbccbc 100644
--- a/config/locales/responders.es.yml
+++ b/config/locales/responders.es.yml
@@ -3,10 +3,10 @@ es:
     actions:
       create:
         notice: "%{resource_name} creado correctamente."
-      update:
-        notice: "%{resource_name} actualizado correctamente."
-      destroy:
-        notice: "%{resource_name} borrado correctamente."
-        alert: "%{resource_name} no ha podido ser borrado."
+      # update:
+        # notice: "%{resource_name} actualizado correctamente."
+      # destroy:
+        # notice: "%{resource_name} borrado correctamente."
+        # alert: "%{resource_name} no ha podido ser borrado."
       save_changes:
         notice: "Cambios guardados"
diff --git a/db/migrate/20150806135245_add_nickname_to_user.rb b/db/migrate/20150806135245_add_nickname_to_user.rb
new file mode 100644
index 000000000..06bf046f9
--- /dev/null
+++ b/db/migrate/20150806135245_add_nickname_to_user.rb
@@ -0,0 +1,5 @@
+class AddNicknameToUser < ActiveRecord::Migration
+  def change
+    add_column :users, :nickname, :string
+  end
+end
diff --git a/db/migrate/20150806140048_add_use_nickname_to_users.rb b/db/migrate/20150806140048_add_use_nickname_to_users.rb
new file mode 100644
index 000000000..032a791cd
--- /dev/null
+++ b/db/migrate/20150806140048_add_use_nickname_to_users.rb
@@ -0,0 +1,5 @@
+class AddUseNicknameToUsers < ActiveRecord::Migration
+  def change
+    add_column :users, :use_nickname, :boolean, null: false, default: false
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index f75de4884..e5f6f9c0a 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20150806111435) do
+ActiveRecord::Schema.define(version: 20150806140048) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -62,24 +62,26 @@ ActiveRecord::Schema.define(version: 20150806111435) do
   add_index "tags", ["name"], name: "index_tags_on_name", unique: true, using: :btree
 
   create_table "users", force: :cascade do |t|
-    t.string   "email",                  default: "", null: false
-    t.string   "encrypted_password",     default: "", null: false
+    t.string   "email",                  default: "",    null: false
+    t.string   "encrypted_password",     default: "",    null: false
     t.string   "reset_password_token"
     t.datetime "reset_password_sent_at"
     t.datetime "remember_created_at"
-    t.integer  "sign_in_count",          default: 0,  null: false
+    t.integer  "sign_in_count",          default: 0,     null: false
     t.datetime "current_sign_in_at"
     t.datetime "last_sign_in_at"
     t.string   "current_sign_in_ip"
     t.string   "last_sign_in_ip"
-    t.datetime "created_at",                          null: false
-    t.datetime "updated_at",                          null: false
+    t.datetime "created_at",                             null: false
+    t.datetime "updated_at",                             null: false
     t.string   "first_name"
     t.string   "last_name"
     t.string   "confirmation_token"
     t.datetime "confirmed_at"
     t.datetime "confirmation_sent_at"
     t.string   "unconfirmed_email"
+    t.string   "nickname"
+    t.boolean  "use_nickname",           default: false, null: false
   end
 
   add_index "users", ["confirmation_token"], name: "index_users_on_confirmation_token", unique: true, using: :btree
diff --git a/spec/i18n_spec.rb b/spec/i18n_spec.rb
new file mode 100644
index 000000000..5237b7240
--- /dev/null
+++ b/spec/i18n_spec.rb
@@ -0,0 +1,17 @@
+require 'i18n/tasks'
+
+RSpec.describe 'I18n' do
+  let(:i18n) { I18n::Tasks::BaseTask.new }
+  let(:missing_keys) { i18n.missing_keys }
+  let(:unused_keys) { i18n.unused_keys }
+
+  it 'does not have missing keys' do
+    expect(missing_keys).to be_empty,
+      "Missing #{missing_keys.leaves.count} i18n keys, run `i18n-tasks missing' to show them"
+  end
+
+  it 'does not have unused keys' do
+    expect(unused_keys).to be_empty,
+      "#{unused_keys.leaves.count} unused i18n keys, run `i18n-tasks unused' to show them"
+  end
+end
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index 80c91c2d4..bad3ac182 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -1,4 +1,50 @@
 require 'rails_helper'
 
 describe User do
+  subject { build(:user) }
+
+  it "is valid" do
+    expect(subject).to be_valid
+  end
+
+  describe 'use_nickname' do
+    describe 'when true' do
+      before { subject.use_nickname = true }
+
+      it "activates the validation of nickname" do
+        subject.nickname = nil
+        expect(subject).to_not be_valid
+
+        subject.nickname = "dredd"
+        expect(subject).to be_valid
+      end
+
+      it "calculates the name using the nickname" do
+        subject.nickname = "dredd"
+        expect(subject.name).to eq("dredd")
+      end
+    end
+
+    describe 'when false' do
+      before { subject.use_nickname = false }
+
+      it "activates the validation of first_name and last_name" do
+        subject.first_name = nil
+        subject.last_name = nil
+        expect(subject).to_not be_valid
+
+        subject.first_name = "Joseph"
+        subject.last_name = "Dredd"
+        expect(subject).to be_valid
+      end
+
+      it "calculates the name using first_name and last_name" do
+        subject.first_name = "Joseph"
+        subject.last_name = "Dredd"
+        expect(subject.name).to eq("Joseph Dredd")
+      end
+    end
+  end
+
+
 end