Merge pull update with lasted oficial grocery-crud

* Replace isset with array_key_exists to check post_array
* Replace the isset with property_exists to check rown database
* translated some missing english in spanish

Author: mckaygerhard

application/libraries/Grocery_CRUD.php

@@ -858,7 +858,7 @@ protected function db_update_validation()
 					$this->basic_model->where($primary_key,$state_info->primary_key);
 					$row = $this->basic_model->get_row();
 
-					if(!isset($row->$field_name)) {
+					if(!property_exists($row, $field_name)) {
 						throw new Exception("The field name doesn't exist in the database. ".
 								 			"Please use the unique fields only for fields ".
 											"that exist in the database");
@@ -955,7 +955,7 @@ protected function db_insert($state_info)
 						$post_data[$field->field_name] = array();
 					}
 
-					if(isset($post_data[$field->field_name]) && !isset($this->relation_n_n[$field->field_name]))
+					if(array_key_exists($field->field_name, $post_data) && !isset($this->relation_n_n[$field->field_name]))
 					{
 						if(isset($types[$field->field_name]->db_null) && $types[$field->field_name]->db_null && is_array($post_data[$field->field_name]) && empty($post_data[$field->field_name]))
 						{
@@ -1080,7 +1080,7 @@ protected function db_update($state_info)
 						$post_data[$field->field_name] = array();
 					}
 
-					if(isset($post_data[$field->field_name]) && !isset($this->relation_n_n[$field->field_name]))
+					if(array_key_exists($field->field_name, $post_data) && !isset($this->relation_n_n[$field->field_name]))
 					{
 						if(isset($types[$field->field_name]->db_null) && $types[$field->field_name]->db_null && is_array($post_data[$field->field_name]) && empty($post_data[$field->field_name]))
 						{

assets/grocery_crud/languages/spanish.php

@@ -86,15 +86,15 @@
 	$lang['list_more'] = 'Mas';
 
 	/* Added in version 1.5.6 */
-	$lang['list_search_column'] = 'Search {column_name}';
+	$lang['list_search_column'] = 'Buscar por {column_name}';
 
 	/* Added in version 1.5.8 */
-	$lang['alert_delete_multiple'] = 'Are you sure that you want to delete those {items_amount} items?';
+	$lang['alert_delete_multiple'] = '¿Estás seguro que deseas eliminar esos {items_amount} elementos?';
 
-	$lang['alert_delete_multiple_one'] = 'Are you sure that you want to delete this 1 item?';
+	$lang['alert_delete_multiple_one'] = '¿Estás seguro que deseas eliminar ese 1 elemento?';
 
 
 
 	/* Added in version 1.6.1 */
-	$lang['list_clone'] = 'Clone';
+	$lang['list_clone'] = 'Clonar';