diff --git a/term_hierarchy.module b/term_hierarchy.module
index 28ef8bb..134dadb 100644
--- a/term_hierarchy.module
+++ b/term_hierarchy.module
@@ -100,7 +100,7 @@ function term_hierarchy_field_widget_form(&$form, &$form_state, $field, $instanc
   $select = array();
   $select['parent'] = array(
     '#type' => 'select',
-    '#options' => array('' => '-Select-') + $p_options,
+    '#options' => array('' => t('-Select-')) + $p_options,
     '#default_value' => $p_default,
     '#title' => $element['#title'],
     '#required' => $element['#required'],
@@ -132,7 +132,7 @@ function term_hierarchy_field_widget_form(&$form, &$form_state, $field, $instanc
     }
     $select['childs']['th_child_' . $i] = array(
       '#type' => 'select',
-      '#options' => array('' => '-Select-') + $c_options,
+      '#options' => array('' => t('-Select-')) + $c_options,
       '#default_value' => $c_default_value,
       '#prefix' => '<div id="term_hierarchy_' . $field_name . '_' . $delta . '_child_wrapper_' . ($i - 1) . '">',
       '#suffix' => "</div>",
@@ -206,7 +206,7 @@ function term_hierarchy_field_widget_form(&$form, &$form_state, $field, $instanc
 
 /**
  * Validate the form field.
- * 
+ *
  * @param array $element
  *  Form field array on which validation implemented.
  * @param array $form_state
@@ -228,7 +228,7 @@ function term_hierarchy_field_vali($element, &$form_state, &$form) {
 
 /**
  * Validate the form field.
- * 
+ *
  * @param array $element
  *  Form field array on which validation implemented.
  * @param array $form_state
@@ -249,15 +249,15 @@ function term_hierarchy_field_childs_vali($element, &$form_state, &$form) {
 
 /*
  * Find the deepest term tid.
- * 
+ *
  * @param array $parent
  *  Parent keys of the field.
  * @param array $values
  *  Sumitted values of the form.
- * 
+ *
  * @return integer
  *  Return the deepect term tid.
- * 
+ *
  * @see term_hierarchy_field_vali
  */
 
@@ -328,14 +328,14 @@ function term_hierarchy_term_get_children($vid, $parent = 0, $reset = FALSE) {
 }
 
 /**
- * 
+ *
  * @param array $form
  *  Completed drupal form.
  * @param type $form_state
  *  Form submitted values.
  * @return type
  *  Return the port of the ajax which want to update seemlessly.
- * 
+ *
  * @see term_hierarchy_field_widget_form
  */
 function term_hierarchy_update_child(&$form, &$form_state) {
@@ -352,7 +352,7 @@ function term_hierarchy_update_child(&$form, &$form_state) {
 }
 
 /**
- * 
+ *
  * @param integer $vid
  *  Vocabulary vid.
  * @param integer  $sel_tid
@@ -361,7 +361,7 @@ function term_hierarchy_update_child(&$form, &$form_state) {
  *  Siblings terms.
  * @param integer $i
  *  Index id.
- *  
+ *
  * @return array
  *  Return all options of the term.
  */