diff --git a/src/application/config/config.php b/src/application/config/config.php
index 25b13704..92e7a5bd 100644
--- a/src/application/config/config.php
+++ b/src/application/config/config.php
@@ -29,8 +29,8 @@ $config['base_url']	= SystemConfiguration::$base_url;
 | the global "config" variable.
 |
 */
-$config['ea_version'] = '0.7.1'; // This must be changed manually.
-$config['ea_release_title'] = 'Beta'; // Leave empty for no title or add BETA, TEST etc ...
+$config['ea_version'] = '1.0'; // This must be changed manually.
+$config['ea_release_title'] = ''; // Leave empty for no title or add BETA, TEST etc ...
 $config['ea_google_sync_feature'] = SystemConfiguration::$google_sync_feature;
 
 /*
diff --git a/src/application/controllers/appointments.php b/src/application/controllers/appointments.php
index b8b73847..0cd0b7bf 100644
--- a/src/application/controllers/appointments.php
+++ b/src/application/controllers/appointments.php
@@ -619,7 +619,7 @@ class Appointments extends CI_Controller {
      */
     public function ajax_install() {
         try {
-            // 2nd method using the ci database class.
+            // Create E!A database structure.
             $file_contents = file_get_contents($this->config->item('base_url') . 'assets/sql/structure.sql');
             $sql_queries = explode(';', $file_contents);
             array_pop($sql_queries);
@@ -633,7 +633,13 @@ class Appointments extends CI_Controller {
             $admin['settings']['username'] = $admin['username'];
             $admin['settings']['password'] = $admin['password'];
             unset($admin['username'], $admin['password']);
-            $this->admins_model->add($admin);
+            $admin['id'] = $this->admins_model->add($admin);
+            
+            $this->load->library('session');
+            $this->session->set_userdata('user_id', $admin['id']);
+            $this->session->set_userdata('user_email', $admin['email']);
+            $this->session->set_userdata('role_slug', DB_SLUG_ADMIN);
+            $this->session->set_userdata('username', $admin['settings']['username']);
             
             // Save company settings
             $this->load->model('settings_model');
diff --git a/src/application/controllers/backend.php b/src/application/controllers/backend.php
index 56a2edd0..9879b66b 100644
--- a/src/application/controllers/backend.php
+++ b/src/application/controllers/backend.php
@@ -265,7 +265,7 @@ class Backend extends CI_Controller {
     public function update() {
         try {
             if (!$this->hasPrivileges(PRIV_SYSTEM_SETTINGS, TRUE)) 
-                throw new Exception('You do not have the required privileges for this task.');
+                throw new Exception('You do not have the required privileges for this task!');
 
             $this->load->library('migration');
 
diff --git a/src/application/controllers/backend_api.php b/src/application/controllers/backend_api.php
index 71d37b66..1ee5d184 100644
--- a/src/application/controllers/backend_api.php
+++ b/src/application/controllers/backend_api.php
@@ -12,6 +12,14 @@ class Backend_api extends CI_Controller {
         $this->load->library('session');
         $this->load->model('roles_model');
         $this->privileges = $this->roles_model->get_privileges($this->session->userdata('role_slug'));
+        
+        // Set user's selected language.        
+        if ($this->session->userdata('language')) {
+        	$this->config->set_item('language', $this->session->userdata('language'));
+        	$this->lang->load('translations', $this->session->userdata('language'));
+        } else {
+        	$this->lang->load('translations', $this->config->item('language')); // default
+        }
     }
     
     /**
@@ -176,25 +184,22 @@ class Backend_api extends CI_Controller {
                             ->get_setting('notifications', $provider['id']);
                 
                 if (!$manage_mode) {
-                    $customer_title = 'Your appointment has been successfully booked!';
-                    $customer_message = 'Thank you for arranging an appointment with us. '   
-                            . 'Below you can see the appointment details. Make changes '  
-                            . 'by clicking the appointment link.';
+                    $customer_title = $this->lang->line('appointment_booked');
+                    $customer_message = $this->lang->line('thank_your_for_appointment');
                     $customer_link = $this->config->item('base_url') . 'appointments/index/' 
                             . $appointment['hash'];
 
-                    $provider_title = 'A new appointment has been added to your plan.';
-                    $provider_message = 'You can make changes by clicking the appointment '  
-                            . 'link below';
+                    $provider_title = $this->lang->line('appointment_added_to_your_plan');
+                    $provider_message = $this->lang->line('appointment_link_description');
                     $provider_link = $this->config->item('base_url') . 'backend/index/' 
                             . $appointment['hash'];
                 } else {
-                    $customer_title = 'Appointment changes have been successfully saved!';
+                    $customer_title = $this->lang->line('appointment_changes_saved');
                     $customer_message = '';
                     $customer_link = $this->config->item('base_url') . 'appointments/index/' 
                             . $appointment['hash'];
 
-                    $provider_title = 'Appointment changes have been successfully saved!';
+                    $provider_title = $this->lang->line('appointment_details_changed');
                     $provider_message = '';
                     $provider_link = $this->config->item('base_url') . 'backend/index/' 
                             . $appointment['hash'];
diff --git a/src/application/controllers/test.php b/src/application/controllers/test.php
index 4d45715c..062d340e 100644
--- a/src/application/controllers/test.php
+++ b/src/application/controllers/test.php
@@ -24,6 +24,12 @@ class Test extends CI_Controller {
             return;
         }
         
+        if (ENVIRONMENT !== 'development') {
+            $this->output->set_output('Tests are available only at development environment. '
+                    . 'Please check your "index.php" file settings.');
+            return;
+        }
+        
         $this->load->view('general/test');
         $this->unit_tests->run_all_tests();
     } 
diff --git a/src/application/language/english/translations_lang.php b/src/application/language/english/translations_lang.php
index 478d05b7..0f8d123a 100644
--- a/src/application/language/english/translations_lang.php
+++ b/src/application/language/english/translations_lang.php
@@ -226,7 +226,7 @@ $lang['backend_calendar'] = 'Backend Calendar';
 $lang['start_date_time'] = 'Start Date / Time';
 $lang['end_date_time'] = 'End Date / Time';
 $lang['licensed_under'] = 'Licensed Under';
-$lang['unexpected_issues_occurred'] = 'Unexpected issues occured!';
+$lang['unexpected_issues_occurred'] = 'Unexpected issues occurred!';
 $lang['service_communication_error'] = 'A server communication error occurred, please try again.';
 $lang['no_privileges_edit_appointments'] = 'You do not have the required privileges to edit appointments.';
 $lang['unavailable_updated'] = 'Unavailable time period updated successfully!';
diff --git a/src/application/language/german/translations_lang.php b/src/application/language/german/translations_lang.php
index 409aadbb..6b845e2b 100644
--- a/src/application/language/german/translations_lang.php
+++ b/src/application/language/german/translations_lang.php
@@ -226,7 +226,7 @@ $lang['backend_calendar'] = 'Backend Kalender';
 $lang['start_date_time'] = 'Start Datum / Zeit';
 $lang['end_date_time'] = 'Ende Datum / Zeit';
 $lang['licensed_under'] = 'Lizenzierte Unter';
-$lang['unexpected_issues_occured'] = 'Unerwartete Probleme aufgetreten!';
+$lang['unexpected_issues_occurred'] = 'Unerwartete Probleme aufgetreten!';
 $lang['service_communication_error'] = 'Während der Kommunikation mit dem Server ist ein Fehler aufgetreten, bitte versuchen Sie es erneut.';
 $lang['no_privileges_edit_appointments'] = 'Sie haben nicht die Berechtigung, um Termine zu bearbeiten.';
 $lang['unavailable_updated'] = 'Nicht zur Verfügung stehender Zeitraum erfolgreich erneuert worden!';
diff --git a/src/application/language/greek/translations_lang.php b/src/application/language/greek/translations_lang.php
index c29b582c..2abab803 100644
--- a/src/application/language/greek/translations_lang.php
+++ b/src/application/language/greek/translations_lang.php
@@ -226,7 +226,7 @@ $lang['backend_calendar'] = 'Ημερολόγιο Backend';
 $lang['start_date_time'] = 'Ημ. / Ώρα Έναρξης';
 $lang['end_date_time'] = 'Ημ. / Ώρα Λήξης';
 $lang['licensed_under'] = 'Σύμφωνα Με Την Άδεια';
-$lang['unexpected_issues_occured'] = 'Παρουσιάστηκαν απροσδόκητα προβλήματα!';
+$lang['unexpected_issues_occurred'] = 'Παρουσιάστηκαν απροσδόκητα προβλήματα!';
 $lang['service_communication_error'] = 'Παρουσιάστηκε σφάλμα κατά την επικοινωνία με τον διακομιστή, παρακαλώ προσπαθήστε ξανά.';
 $lang['no_privileges_edit_appointments'] = 'Δεν έχετε τα απαραίτητα δικαιώματα για να επεξεργαστείτε ραντεβού.';
 $lang['unavailable_updated'] = 'Η μη διαθέσιμη περίοδος ενημερώθηκε επιτυχώς!';
diff --git a/src/application/models/customers_model.php b/src/application/models/customers_model.php
index 2c272ace..fb00e7ff 100644
--- a/src/application/models/customers_model.php
+++ b/src/application/models/customers_model.php
@@ -21,7 +21,7 @@ class Customers_Model extends CI_Model {
      */
     public function add($customer) {
         // Validate the customer data before doing anything.
-        !$this->validate($customer);
+        $this->validate($customer);
         
         // :: CHECK IF CUSTOMER ALREADY EXIST (FROM EMAIL).	
         if ($this->exists($customer) && !isset($customer['id'])) {
@@ -103,6 +103,12 @@ class Customers_Model extends CI_Model {
      * @return int Returns the updated record id.
      */
     private function update($customer) {        
+        // Do not update empty string values.
+        foreach ($customer as $key => $value) {
+            if ($value === '') 
+                unset($customer[$key]);
+        }
+        
         $this->db->where('id', $customer['id']);
         if (!$this->db->update('ea_users', $customer)) {
             throw new Exception('Could not update customer to the database.');
@@ -147,8 +153,7 @@ class Customers_Model extends CI_Model {
     }
     
     /**
-     * Validate customer data before the insert or 
-     * update operation is executed.
+     * Validate customer data before the insert or update operation is executed.
      * 
      * @param array $customer Contains the customer data.
      * @return bool Returns the validation result.
@@ -156,7 +161,6 @@ class Customers_Model extends CI_Model {
     public function validate($customer) {
         $this->load->helper('data_validation');
         
-        
         // If a customer id is provided, check whether the record
         // exist in the database.
         if (isset($customer['id'])) {
diff --git a/src/application/models/user_model.php b/src/application/models/user_model.php
index d9f826cf..38c60c01 100644
--- a/src/application/models/user_model.php
+++ b/src/application/models/user_model.php
@@ -81,7 +81,7 @@ class User_Model extends CI_Model {
                 ->select('ea_users.id AS user_id, ea_users.email AS user_email, '
                         . 'ea_roles.slug AS role_slug, ea_user_settings.username')
                 ->from('ea_users')
-                ->join('ea_roles', 'ea_roles.id = ea_users.id_roles', 'innder')
+                ->join('ea_roles', 'ea_roles.id = ea_users.id_roles', 'inner')
                 ->join('ea_user_settings', 'ea_user_settings.id_users = ea_users.id')
                 ->where('ea_user_settings.username', $username)
                 ->where('ea_user_settings.password', $password)
diff --git a/src/application/views/backend/calendar.php b/src/application/views/backend/calendar.php
index 13b8c762..2841a47d 100644
--- a/src/application/views/backend/calendar.php
+++ b/src/application/views/backend/calendar.php
@@ -214,7 +214,7 @@
                     </button>
                     <input type="text" id="filter-existing-customers"
                            placeholder="<?php echo $this->lang->line('type_to_filter_customers'); ?>" 
-                           style="display: none;" class="input-medium"/>
+                           style="display: none;" class="input-medium span4"/>
                     <div id="existing-customers-list" style="display: none;"></div>
                 </legend>
 
diff --git a/src/assets/css/backend.css b/src/assets/css/backend.css
index 4d55b823..ed11aa18 100644
--- a/src/assets/css/backend.css
+++ b/src/assets/css/backend.css
@@ -257,6 +257,7 @@ body .jspTrack {
 #filter-existing-customers {
     display: inline-block;
     height: 14px;
+    min-height: 24px;
     font-size: 12px;
 }
 
@@ -312,7 +313,7 @@ body .form-horizontal .controls {
 }
 
 #customers-page #customer-appointments { 
-    height: 250px; 
+    height: 370px; 
     width: 330px;
     border: 4px solid #E2E2E2; 
     margin-bottom: 20px; 
@@ -502,7 +503,7 @@ body .form-horizontal .controls {
 #users-page #provider-services { 
     border: 4px solid #ccc; 
     width: 340px; 
-    height: 140px; 
+    height: 387px; 
     overflow-y: scroll; 
     padding: 7px;
 }
diff --git a/src/assets/js/backend_calendar.js b/src/assets/js/backend_calendar.js
index 3468962a..b0164eb1 100644
--- a/src/assets/js/backend_calendar.js
+++ b/src/assets/js/backend_calendar.js
@@ -548,7 +548,7 @@ var BackendCalendar = {
                     $dialog.find('.modal-message').text(EALang['unexpected_issues_occurred']);
                     $dialog.find('.modal-message').addClass('alert-error');
                     $dialog.find('.modal-message').fadeIn();
-                    return;
+                    return false;
                 }
                 
                 // Display success message to the user.
@@ -882,7 +882,7 @@ var BackendCalendar = {
                     $('#address').val(c.address);
                     $('#city').val(c.city);
                     $('#zip-code').val(c.zip_code);
-                    $('#customer-code').val(c.notes);
+                    $('#customer-notes').val(c.notes);
                     return false;
                 }
             });
@@ -1920,13 +1920,13 @@ var BackendCalendar = {
                 }
             }); 
             if (missingRequiredField) {
-                throw 'Fields with * are required!';                       
+                throw EALang['fields_are_required'];                       
             }
              
             // :: CHECK EMAIL ADDRESS
             if (!GeneralFunctions.validateEmail($dialog.find('#email').val())) {
                 $dialog.find('#email').parents().eq(1).addClass('error');
-                throw 'Invalid email address!';
+                throw EALang['invalid_email'];
             }
             
             // :: CHECK APPOINTMENT START AND END TIME
@@ -1935,7 +1935,7 @@ var BackendCalendar = {
             if (start > end) {
                 $dialog.find('#start-datetime').parents().eq(1).addClass('error');
                 $dialog.find('#end-datetime').parents().eq(1).addClass('error');
-                throw 'Appointment start must be prior to appointment end date!';
+                throw EALang['start_date_before_end_error'];
             }
             
             return true;
diff --git a/src/assets/js/backend_users_secretaries.js b/src/assets/js/backend_users_secretaries.js
index 6524df86..5bbf161c 100644
--- a/src/assets/js/backend_users_secretaries.js
+++ b/src/assets/js/backend_users_secretaries.js
@@ -359,7 +359,7 @@ SecretariesHelper.prototype.filter = function(key, selectId, display) {
         $('#filter-secretaries .results').jScrollPane({ mouseWheelSpeed: 70 });
         
         if (response.length == 0) {
-            $('#filter-secretaries .results').html('<em>No results found ...</em>')
+            $('#filter-secretaries .results').html('<em>' + EALang['no_records_found'] + '</em>')
         }
         
         if (selectId != undefined) {
diff --git a/src/assets/js/frontend_book.js b/src/assets/js/frontend_book.js
index ba705df8..1b0804a2 100644
--- a/src/assets/js/frontend_book.js
+++ b/src/assets/js/frontend_book.js
@@ -267,7 +267,7 @@ var FrontendBook = {
                     response.exceptions = GeneralFunctions.parseExceptions(response.exceptions);
                     GeneralFunctions.displayMessageBox('Unexpected Issues', 'Unfortunately '
                             + 'the check appointment time availability could not be completed. '
-                            + 'The following issues occured:');
+                            + 'The following issues occurred:');
                     $('#message_box').append(GeneralFunctions.exceptionsToHtml(response.exceptions));
                     return false;
                 } 
diff --git a/src/assets/js/working_plan.js b/src/assets/js/working_plan.js
index b9b6a2d3..4f6e35e0 100644
--- a/src/assets/js/working_plan.js
+++ b/src/assets/js/working_plan.js
@@ -200,7 +200,7 @@ WorkingPlan.prototype.bindEventHandlers = function() {
         // Reset previous editable tds
         var $previousEdt = $(this).closest('table').find('.editable').get();
         $.each($previousEdt, function(index, edt) {
-           edt.reset();
+            if (edt.reset !== undefined) edt.reset();
         });
 
         // Make all cells in current row editable.