diff --git a/application/config/migration.php b/application/config/migration.php
index c6de3a74..957d49d0 100755
--- a/application/config/migration.php
+++ b/application/config/migration.php
@@ -21,7 +21,7 @@ $config['migration_enabled'] = TRUE;
 | be upgraded / downgraded to.
 |
 */
-$config['migration_version'] = 19;
+$config['migration_version'] = 20;
 
 
 /*
diff --git a/application/controllers/Appointments.php b/application/controllers/Appointments.php
index 09c8b61d..3916238f 100755
--- a/application/controllers/Appointments.php
+++ b/application/controllers/Appointments.php
@@ -1024,6 +1024,8 @@ class Appointments extends CI_Controller {
                 $appointment['location'] = $service['location'];
             }
 
+            // save customer language (the language which is used to render the booking page)
+            $customer['language'] = $this->config->item('language');
             $customer_id = $this->customers_model->add($customer);
 
             $appointment['id_users_customer'] = $customer_id;
diff --git a/application/language/english/translations_lang.php b/application/language/english/translations_lang.php
index 21ac685c..80d6e4d6 100755
--- a/application/language/english/translations_lang.php
+++ b/application/language/english/translations_lang.php
@@ -20,6 +20,8 @@ $lang['address'] = 'Address';
 $lang['city'] = 'City';
 $lang['zip_code'] = 'Zip Code';
 $lang['notes'] = 'Notes';
+$lang['language'] = 'Language';
+$lang['no_language'] = 'No language';
 $lang['fields_are_required'] = 'Fields with * are required!';
 $lang['step_four_title'] = 'Confirm Appointment';
 $lang['confirm'] = 'Confirm';
diff --git a/application/language/french/translations_lang.php b/application/language/french/translations_lang.php
index dc4f37dc..eb3c4bdd 100755
--- a/application/language/french/translations_lang.php
+++ b/application/language/french/translations_lang.php
@@ -20,6 +20,8 @@ $lang['address'] = 'Adresse';
 $lang['city'] = 'Ville';
 $lang['zip_code'] = 'Code postal';
 $lang['notes'] = 'Commentaires';
+$lang['language'] = 'Langue';
+$lang['no_language'] = 'Pas de langue';
 $lang['fields_are_required'] = 'Les champs avec * sont obligatoires';
 $lang['step_four_title'] = 'Confirmez votre rendez-vous';
 $lang['confirm'] = 'Confirmation';
diff --git a/application/language/german/translations_lang.php b/application/language/german/translations_lang.php
index d8af8f51..26beae18 100755
--- a/application/language/german/translations_lang.php
+++ b/application/language/german/translations_lang.php
@@ -20,6 +20,7 @@ $lang['address'] = 'Adresse';
 $lang['city'] = 'Stadt';
 $lang['zip_code'] = 'Postleitzahl';
 $lang['notes'] = 'Bemerkungen';
+$lang['language'] = 'Sprache';
 $lang['fields_are_required'] = 'Die Felder mit einem * sind Pflichtfelder!';
 $lang['step_four_title'] = 'Bitte bestätigen Sie die Terminauswahl';
 $lang['confirm'] = 'Bestätigung';
diff --git a/application/migrations/020_add_language_to_users.php b/application/migrations/020_add_language_to_users.php
new file mode 100644
index 00000000..2a28bc02
--- /dev/null
+++ b/application/migrations/020_add_language_to_users.php
@@ -0,0 +1,48 @@
+<?php defined('BASEPATH') or exit('No direct script access allowed');
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2020, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.4.0
+ * ---------------------------------------------------------------------------- */
+
+/**
+ * Class Migration_Add_language_to_users
+ *
+ * @property CI_DB_query_builder db
+ * @property CI_DB_forge dbforge
+ */
+class Migration_Add_language_to_users extends CI_Migration {
+    /**
+     * Upgrade method.
+     */
+    public function up()
+    {
+        if ( ! $this->db->field_exists('language', 'users'))
+        {
+            $fields = [
+                'language' => [
+                    'type' => 'VARCHAR',
+                    'constraint' => '256',
+                    'default' => '',
+                    'after' => 'timezone'
+                ]
+            ];
+
+            $this->dbforge->add_column('users', $fields);
+        }
+    }
+
+    /**
+     * Downgrade method.
+     */
+    public function down()
+    {
+        $this->dbforge->drop_column('users', 'language');
+    }
+}
diff --git a/application/views/backend/customers.php b/application/views/backend/customers.php
index 3f1d527f..d4bf2d10 100755
--- a/application/views/backend/customers.php
+++ b/application/views/backend/customers.php
@@ -132,6 +132,11 @@
                         <input id="zip-code" class="form-control">
                     </div>
 
+                    <div class="form-group">
+                        <label for="language"><?= lang('language') ?></label>
+                        <select id="language" class="form-control"></select>
+                    </div>
+
                     <div class="form-group">
                         <label for="timezone"><?= lang('timezone') ?></label>
                         <?= render_timezone_dropdown('id="timezone" class="form-control"') ?>
diff --git a/assets/js/backend_customers.js b/assets/js/backend_customers.js
index bb1a021e..ccf52b6a 100644
--- a/assets/js/backend_customers.js
+++ b/assets/js/backend_customers.js
@@ -42,6 +42,13 @@ window.BackendCustomers = window.BackendCustomers || {};
     exports.initialize = function (defaultEventHandlers) {
         defaultEventHandlers = defaultEventHandlers || false;
 
+        // Fill available service categories listbox.
+        availableLanguages.forEach(function (language) {
+            $('#language').append(new Option(language, language));
+        });
+
+        $('#language').append(new Option('- ' + EALang.no_language + ' -', null)).val('null');
+
         helper = new CustomersHelper();
         helper.resetForm();
         helper.filter('');
diff --git a/assets/js/backend_customers_helper.js b/assets/js/backend_customers_helper.js
index 9956d2fd..f5bb98e5 100644
--- a/assets/js/backend_customers_helper.js
+++ b/assets/js/backend_customers_helper.js
@@ -150,6 +150,12 @@
                 timezone: $('#timezone').val()
             };
 
+            if ($('#language').val() !== 'null') {
+                customer.language = $('#language').val();
+            } else {
+                customer.language = '';
+            }
+
             if ($('#customer-id').val()) {
                 customer.id = $('#customer-id').val();
             }
@@ -279,6 +285,8 @@
         $('.record-details').find('input, textarea').val('');
         $('.record-details').find('input, textarea').prop('readonly', true);
 
+        $('#language').val('null');
+
         $('#customer-appointments').empty();
         $('#appointment-details').toggleClass('hidden', true).empty();
         $('#edit-customer, #delete-customer').prop('disabled', true);
@@ -310,6 +318,9 @@
         $('#notes').val(customer.notes);
         $('#timezone').val(customer.timezone);
 
+        var language = (customer.language !== '') ? customer.language : 'null';
+        $('#language').val(language);
+
         $('#customer-appointments').empty();
         customer.appointments.forEach(function (appointment) {
             if (GlobalVariables.user.role_slug === Backend.DB_SLUG_PROVIDER && parseInt(appointment.id_users_provider) !== GlobalVariables.user.id) {