diff --git a/languages/tinymce-annotate-ca_ES.mo b/languages/tinymce-annotate-ca_ES.mo
index d25f84a..b6b4c76 100644
Binary files a/languages/tinymce-annotate-ca_ES.mo and b/languages/tinymce-annotate-ca_ES.mo differ
diff --git a/languages/tinymce-annotate-ca_ES.po b/languages/tinymce-annotate-ca_ES.po
index a53a7d3..7fc582b 100644
--- a/languages/tinymce-annotate-ca_ES.po
+++ b/languages/tinymce-annotate-ca_ES.po
@@ -2,7 +2,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: tinymce-annotate\n"
 "POT-Creation-Date: 2016-03-16 12:53+0100\n"
-"PO-Revision-Date: 2016-03-16 13:00+0100\n"
+"PO-Revision-Date: 2016-03-17 09:33+0100\n"
 "Last-Translator: \n"
 "Language-Team: \n"
 "MIME-Version: 1.0\n"
@@ -21,3 +21,21 @@ msgstr "Selecciona el text per a crear l'annotació"
 
 msgid "Please select the annotation you want to delete"
 msgstr "Selecciona l'anotació per a esborrar-la"
+
+msgid "Delete annotation"
+msgstr "Esborra annotació"
+
+msgid "Create annotation"
+msgstr "Crea annotació"
+
+msgid "Hide annotations"
+msgstr "Oculta les annotacions"
+
+msgid "Annotation settings"
+msgstr "Paràmetres de l'annotació"
+
+msgid "Annotation"
+msgstr "Annotació"
+
+msgid "Background color"
+msgstr "Color de fons"
diff --git a/languages/tinymce-annotate-es_ES.mo b/languages/tinymce-annotate-es_ES.mo
index 89184e4..699fe4e 100644
Binary files a/languages/tinymce-annotate-es_ES.mo and b/languages/tinymce-annotate-es_ES.mo differ
diff --git a/languages/tinymce-annotate-es_ES.po b/languages/tinymce-annotate-es_ES.po
index cd6c45c..4605d23 100644
--- a/languages/tinymce-annotate-es_ES.po
+++ b/languages/tinymce-annotate-es_ES.po
@@ -2,7 +2,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: tinymce-annotate\n"
 "POT-Creation-Date: 2016-03-16 12:53+0100\n"
-"PO-Revision-Date: 2016-03-16 13:23+0100\n"
+"PO-Revision-Date: 2016-03-17 09:34+0100\n"
 "Last-Translator: \n"
 "Language-Team: \n"
 "MIME-Version: 1.0\n"
@@ -21,3 +21,21 @@ msgstr "Selecciona el texto para crear la anotación"
 
 msgid "Please select the annotation you want to delete"
 msgstr "Selecciona la anotación que deseas eliminar"
+
+msgid "Delete annotation"
+msgstr "Borrar anotación"
+
+msgid "Create annotation"
+msgstr "Crear anotación"
+
+msgid "Hide annotations"
+msgstr "Ocultar anotaciones"
+
+msgid "Annotation settings"
+msgstr "Parámetros de anotación"
+
+msgid "Annotation"
+msgstr "Anotación"
+
+msgid "Background color"
+msgstr "Color de fondo"
diff --git a/plugin.js b/plugin.js
index 0e5ec75..4781f50 100644
--- a/plugin.js
+++ b/plugin.js
@@ -45,7 +45,7 @@
 
         // Create annotation
         editor.addButton('tma_annotate', {
-            title: 'Create annotation',
+            title: TMA.tooltips.annotation_create,
             image: url + '/img/annotation.png',
             onclick: function() {
                 annotation = '';
@@ -74,16 +74,16 @@
                         selectedText = node.innerHTML;
                     }
                     editor.windowManager.open({
-                        title: 'Annotation options',
+                        title: TMA.tooltips.annotation_settings,
                         body: [{
                             type: 'textbox',
                             name: 'annotation',
-                            label: 'Annotation',
+                            label: TMA.settings.setting_annotation,
                             value: annotation
                         }, {
                             type: 'colorpicker',
                             name: 'annotationbg',
-                            label: 'Background color',
+                            label: TMA.settings.setting_background,
                             value: color
                         }],
 
@@ -97,20 +97,20 @@
                                editor.selection.setContent('<span class="annotation" data-author="' + TMA.author + '" data-annotation="' + dataAnnotation.replace(/"/g,'&quot;') + '" style="background-color:' + e.data.annotationbg + '">' + selectedText + '</span>');
 
                             } else {
-                                editor.windowManager.alert(TMA.missing_fields);
+                                editor.windowManager.alert(TMA.errors.missing_fields);
                                 return false;
                             }
                         }
                     });
                 } else {
-                    editor.windowManager.alert(TMA.missing_annotation, false);
+                    editor.windowManager.alert(TMA.errors.missing_annotation, false);
                 }
             }
         });
 
         // Delete annotation
         editor.addButton('tma_annotatedelete', {
-            title: 'Delete annotation',
+            title: TMA.tooltips.annotation_delete,
             image: url + '/img/annotation-delete.png',
             onclick: function() {
                 var selectedText = editor.selection.getContent();
@@ -125,14 +125,14 @@
                     $(deletionNode).attr("style", "");
                     editor.dom.remove(replaceNode, deletionNode);
                 } else {
-                    editor.windowManager.alert(TMA.missing_selected);
+                    editor.windowManager.alert(TMA.errors.missing_selected);
                 }
             }
         });
 
         // Hide all annotations
         editor.addButton('tma_annotatehide', {
-            title: 'Hide all annotations',
+            title: TMA.tooltips.annotation_hide,
             image: url + '/img/annotation-hide.png',
             cmd: 'tma_cmd_hide',
             onPostRender: tma_toggleHide
diff --git a/plugin.php b/plugin.php
index cc2e416..e578cc8 100644
--- a/plugin.php
+++ b/plugin.php
@@ -44,14 +44,28 @@ function tma_annotate() {
     load_plugin_textdomain('tinymce-annotate', FALSE, dirname(plugin_basename(__FILE__)).'/languages/');
     $current_user = wp_get_current_user();
     wp_register_script( 'tmajs', plugins_url('/plugin.js', __FILE__));
-    wp_localize_script( 'tmajs', 'TMA', array(
-            'id'                    => $current_user->ID,
-            'author'                => $current_user->display_name,
-            'missing_fields'        => __('Select the color and the annotation text', 'tinymce-annotate'),
-            'missing_annotation'    => __('Please select some text for creating an annotation', 'tinymce-annotate'),
-            'missing_selected'      => __('Please select the annotation you want to delete', 'tinymce-annotate')
-            )
+    wp_localize_script( 'tmajs', 'TMA',
+        array(
+            'id'        => $current_user->ID,
+            'author'    => $current_user->display_name,
+            'errors'    => array(
+                            'missing_fields'        => __('Select the color and the annotation text', 'tinymce-annotate'),
+                            'missing_annotation'    => __('Please select some text for creating an annotation', 'tinymce-annotate'),
+                            'missing_selected'      => __('Please select the annotation you want to delete', 'tinymce-annotate')
+                            ),
+            'tooltips'  => array(
+                            'annotation_settings'   => __('Annotation settings', 'tinymce-annotate'),
+                            'annotation_create'     => __('Create annotation', 'tinymce-annotate'),
+                            'annotation_delete'     => __('Delete annotation', 'tinymce-annotate'),
+                            'annotation_hide'       => __('Hide annotations', 'tinymce-annotate')
+                            ),
+            'settings'  => array(
+                            'setting_annotation'    => __('Annotation', 'tinymce-annotate'),
+                            'setting_background'    => __('Background color', 'tinymce-annotate')
+                            )
+        )
     );
+
     wp_enqueue_script( 'tmajs' );
 }
 
diff --git a/readme.txt b/readme.txt
index 15f48df..f8c1cc7 100644
--- a/readme.txt
+++ b/readme.txt
@@ -50,11 +50,11 @@ Make sure you have selected at least a character.
 
 == Changelog ==
 = 1.1 =
-Release date: March 20, 2016.
+Release date: March 21, 2016.
 
 * Show annotation author.
 * Select annotation without doing it with the mouse.
-* Added I18n.
+* Added I18n (English, Spanish and Catalan).
 
 = 1.0 =
 Release date: November 10, 2015.