diff --git a/in-contact.php b/in-contact.php
index 9bed8bb..51341a4 100644
--- a/in-contact.php
+++ b/in-contact.php
@@ -1,26 +1,28 @@
 <?php
 /*
-    Plugin Name: In Contact test
-    Plugin URI:  https://krzysztof-turek.com
+    Plugin Name: In Contact
+    Plugin URI:  https://rawlab.pl
     Description: Simple Contact Form
     Version:     1.0.1
     Author:      Krzysztof Turek
     Author URI:  https://krzysztof-turek.com
     License:     GPL2
-    License URI: https://krzysztof-turek.com
+    License URI: https://rawlab.pl
+    Text Domain: in-contact
+    Domain Path: /languages
 */
 
+define("INCONTACT_PLUGIN_FILE", __FILE__);
 
 use inContact\Init;
 
-$pluginDirUrl = plugin_dir_url( __FILE__ );
-$pluginPath = plugin_dir_path( __FILE__ );
+$pluginDirUrl = plugin_dir_url(__FILE__);
+$pluginPath = plugin_dir_path(__FILE__);
 
 if (file_exists(dirname(__FILE__) . "/inc/autoload.php")) {
     require_once dirname(__FILE__) . "/inc/autoload.php";
 }
 
 if (class_exists("inContact\Init")) {
-
     Init::getInstance();
-}
\ No newline at end of file
+}
diff --git a/inc/classes/inContact/AdminMenu.php b/inc/classes/inContact/AdminMenu.php
index 0d0e053..1b0b896 100644
--- a/inc/classes/inContact/AdminMenu.php
+++ b/inc/classes/inContact/AdminMenu.php
@@ -7,7 +7,7 @@ namespace inContact;
  *
  * @link https://krzysztof-turek.com
  *
- * @package tylkofotografia.pl
+ * @package inContact
  * @version 0.2
  */
 class AdminMenu
@@ -27,8 +27,8 @@ class AdminMenu
     public function InContactAdminMenu($id)
     {
         add_menu_page(
-            "ustawienia inContact",
-            "inContact",
+            __("InContact settings", "in-contact"),
+            __("InContact", "in-contact"),
             "manage_options",
             "wp-in-contact",
             [$this, "InContactSettings"],
@@ -85,33 +85,48 @@ class AdminMenu
             ?>
 
             <div class="updated">
-                <p>Ustawienia zostały zapisane!</p>
+                <p><?php echo esc_html__(
+                    "Settings saved!",
+                    "in-contact",
+                ); ?></p>
             </div> <?php
         }
         ?>
         <div class="wrap">
-            <h2><span class="dashicons dashicons-email"></span> InContact - Ustawienia</h2>
+            <h2><span class="dashicons dashicons-email"></span> <?php echo esc_html__(
+                "InContact - Settings",
+                "in-contact",
+            ); ?></h2>
             <form method="POST">
                 <input type="hidden" name="updated" value="true"/>
                 <?php wp_nonce_field("incontact-update", "incontact-config"); ?>
                 <table class="form-table">
                     <tbody>
                     <tr>
-                        <th><label for="incontact-site-key">Klucz witryny</label></th>
+                        <th><label for="incontact-site-key"><?php echo esc_html__(
+                            "Site key",
+                            "in-contact",
+                        ); ?></label></th>
                         <td><input name="incontact-site-key" id="incontact-site-key" type="text"
                                    value="<?php echo get_option(
                                        "incontact-site-key",
                                    ); ?>" class="regular-text"/></td>
                     </tr>
                     <tr>
-                        <th><label for="incontact-secret-key">Tajny klucz</label></th>
+                        <th><label for="incontact-secret-key"><?php echo esc_html__(
+                            "Secret key",
+                            "in-contact",
+                        ); ?></label></th>
                         <td><input name="incontact-secret-key" id="incontact-secret-key" type="text"
                                    value="<?php echo get_option(
                                        "incontact-secret-key",
                                    ); ?>" class="regular-text"/></td>
                     </tr>
                     <tr>
-                        <th><label for="incontact-target-mail">Adresat (email)</label></th>
+                        <th><label for="incontact-target-mail"><?php echo esc_html__(
+                            "Recipient (email)",
+                            "in-contact",
+                        ); ?></label></th>
                         <td><input name="incontact-target-mail" id="incontact-target-mail" type="text"
                                    value="<?php echo get_option(
                                        "incontact-target-mail",
@@ -119,21 +134,30 @@ class AdminMenu
                     </tr>
 
                     <tr>
-                        <th><label for="incontact-form-ph-name">Formularz - placeholder nazwa</label></th>
+                        <th><label for="incontact-form-ph-name"><?php echo esc_html__(
+                            "Form - placeholder name",
+                            "in-contact",
+                        ); ?></label></th>
                         <td><input name="incontact-form-ph-name" id="incontact-form-ph-name" type="text"
                                    value="<?php echo get_option(
                                        "incontact-form-ph-name",
                                    ); ?>" class="regular-text"/></td>
                     </tr>
                     <tr>
-                        <th><label for="incontact-form-ph-email">Formularz - placeholder email</label></th>
+                        <th><label for="incontact-form-ph-email"><?php echo esc_html__(
+                            "Form - placeholder email",
+                            "in-contact",
+                        ); ?></label></th>
                         <td><input name="incontact-form-ph-email" id="incontact-form-ph-email" type="text"
                                    value="<?php echo get_option(
                                        "incontact-form-ph-email",
                                    ); ?>" class="regular-text"/></td>
                     </tr>
                     <tr>
-                        <th><label for="incontact-form-ph-message">Formularz - placeholder wiadomość</label></th>
+                        <th><label for="incontact-form-ph-message"><?php echo esc_html__(
+                            "Form - placeholder message",
+                            "in-contact",
+                        ); ?></label></th>
                         <td><input name="incontact-form-ph-message" id="incontact-form-ph-message" type="text"
                                    value="<?php echo get_option(
                                        "incontact-form-ph-message",
@@ -141,21 +165,30 @@ class AdminMenu
                     </tr>
 
                     <tr>
-                        <th><label for="incontact-form-name">Formularz - nazwa nazwa</label></th>
+                        <th><label for="incontact-form-name"><?php echo esc_html__(
+                            "Form - label name",
+                            "in-contact",
+                        ); ?></label></th>
                         <td><input name="incontact-form-name" id="incontact-form-name" type="text"
                                    value="<?php echo get_option(
                                        "incontact-form-name",
                                    ); ?>" class="regular-text"/></td>
                     </tr>
                     <tr>
-                        <th><label for="incontact-form-email">Formularz - nazwa email</label></th>
+                        <th><label for="incontact-form-email"><?php echo esc_html__(
+                            "Form - label email",
+                            "in-contact",
+                        ); ?></label></th>
                         <td><input name="incontact-form-email" id="incontact-form-email" type="text"
                                    value="<?php echo get_option(
                                        "incontact-form-email",
                                    ); ?>" class="regular-text"/></td>
                     </tr>
                     <tr>
-                        <th><label for="incontact-form-message">Formularz - nazwa wiadomość</label></th>
+                        <th><label for="incontact-form-message"><?php echo esc_html__(
+                            "Form - label message",
+                            "in-contact",
+                        ); ?></label></th>
                         <td><input name="incontact-form-message" id="incontact-form-message" type="text"
                                    value="<?php echo get_option(
                                        "incontact-form-message",
@@ -163,7 +196,10 @@ class AdminMenu
                     </tr>
 
                     <tr>
-                        <th><label for="incontact-form-snd-ok">Formularz - wiadomość wysłana popprawnie</label></th>
+                        <th><label for="incontact-form-snd-ok"><?php echo esc_html__(
+                            "Form - message sent successfully",
+                            "in-contact",
+                        ); ?></label></th>
                         <td><input name="incontact-form-snd-ok" id="incontact-form-snd-ok" type="text"
                                    value="<?php echo get_option(
                                        "incontact-form-snd-ok",
@@ -172,7 +208,11 @@ class AdminMenu
                     </tbody>
                 </table>
                 <p class="submit">
-                    <input type="submit" name="submit" id="submit" class="button button-primary" value="Zapisz">
+                    <input type="submit" name="submit" id="submit" class="button button-primary" value="<?php echo esc_attr__(
+                        "Save",
+                        "in-contact",
+                    ); ?>">
+
                 </p>
             </form>
         </div> <?php
diff --git a/inc/classes/inContact/Init.php b/inc/classes/inContact/Init.php
index b3d43c4..15b713d 100644
--- a/inc/classes/inContact/Init.php
+++ b/inc/classes/inContact/Init.php
@@ -16,8 +16,19 @@ class Init
 
     function __construct()
     {
+        $this->loadTextDomain();
         Enqueue::getInstance();
         AdminMenu::getInstance();
         Shortcode::getInstance();
     }
-}
\ No newline at end of file
+    private function loadTextDomain(): void
+    {
+        add_action("plugins_loaded", function (): void {
+            load_plugin_textdomain(
+                "in-contact",
+                false,
+                dirname(plugin_basename(INCONTACT_PLUGIN_FILE)) . "/languages",
+            );
+        });
+    }
+}
diff --git a/inc/classes/inContact/Shortcode.php b/inc/classes/inContact/Shortcode.php
index 6e25da6..204810a 100644
--- a/inc/classes/inContact/Shortcode.php
+++ b/inc/classes/inContact/Shortcode.php
@@ -46,17 +46,25 @@ class Shortcode
             if (!empty($_POST["em_name"])) {
                 $em_name = $_POST["em_name"];
             } else {
-                $error .= "Please enter your name </br>";
+                $error .=
+                    esc_html__("Please enter your name", "in-contact") .
+                    "<br />";
             }
             if (!empty($_POST["em_mail"])) {
                 $em_mail = $_POST["em_mail"];
             } else {
-                $error .= "Please enter your email address </br>";
+                $error .=
+                    esc_html__(
+                        "Please enter your email address",
+                        "in-contact",
+                    ) . "<br />";
             }
             if (!empty($_POST["em_message"])) {
                 $em_message = $_POST["em_message"];
             } else {
-                $error .= "Please enter your message </br>";
+                $error .=
+                    esc_html__("Please enter your message", "in-contact") .
+                    "<br />";
             }
 
             $targetEmail =
@@ -76,11 +84,25 @@ class Shortcode
                 "From: " . $em_name . " <" . $em_mail . ">",
                 "Reply-To: " . $em_name . " <" . $em_mail . ">",
             ];
-            $body = '<!DOCTYPE html>
+            $emailTitle = __("New message from contact form", "in-contact");
+            $emailHeading = __("Contact details", "in-contact");
+            $emailNameLabel = __("Name and surname", "in-contact");
+            $emailEmailLabel = __("Email", "in-contact");
+            $emailMessageHeading = __("Message content", "in-contact");
+            $emailReplyLabel = __("Reply to message", "in-contact");
+            $emailFooter = __(
+                "This email was generated automatically by the website contact form.",
+                "in-contact",
+            );
+            $emailRights = __("All rights reserved.", "in-contact");
+            $body =
+                '<!DOCTYPE html>
 <html lang="pl">
 <head>
     <meta charset="UTF-8">
-    <title>Nowa wiadomość z formularza kontaktowego</title>
+    <title>' .
+                esc_html($emailTitle) .
+                '</title>
     <style>
         body {
             font-family: Arial, sans-serif;
@@ -142,24 +164,40 @@ class Shortcode
 <body>
     <div class="container">
         <div class="header">
-            <h1>📩 Nowa wiadomość z formularza</h1>
+            <h1>📩 ' .
+                esc_html($emailTitle) .
+                '</h1>
         </div>
         <div class="content">
-            <h2>Dane kontaktowe</h2>
-            <p><strong>Imię i nazwisko:</strong> {{IMIE_NAZWISKO}}</p>
-            <p><strong>Email:</strong> {{EMAIL}}</p>
+            <h2>' .
+                esc_html($emailHeading) .
+                '</h2>
+            <p><strong>' .
+                esc_html($emailNameLabel) .
+                ':</strong> {{IMIE_NAZWISKO}}</p>
+            <p><strong>' .
+                esc_html($emailEmailLabel) .
+                ':</strong> {{EMAIL}}</p>
 
 
             <div class="info">
-                <h3>📬 Treść wiadomości:</h3>
+                <h3>📬 ' .
+                esc_html($emailMessageHeading) .
+                ':</h3>
                 <p>{{WIADOMOSC}}</p>
             </div>
 
-            <a href="mailto:{{EMAIL}}" class="button">Odpowiedz na wiadomość</a>
+            <a href="mailto:{{EMAIL}}" class="button">' .
+                esc_html($emailReplyLabel) .
+                '</a>
         </div>
         <div class="footer">
-            Ten e-mail został wygenerowany automatycznie przez formularz kontaktowy strony.<br>
-            © {{ROK}} Twoja Firma. Wszelkie prawa zastrzeżone.
+            ' .
+                esc_html($emailFooter) .
+                '<br>
+            © {{ROK}} Twoja Firma. ' .
+                esc_html($emailRights) .
+                '
         </div>
     </div>
 </body>
@@ -251,7 +289,9 @@ class Shortcode
             get_option("incontact-form-ph-name") .
             '" value="" required>
 			         <div class="invalid-feedback">
-			            Please enter your name!
+			            ' .
+            esc_html__("Please enter your name!", "in-contact") .
+            '
 			         </div>
 			      </div>
 			   </div>
@@ -264,7 +304,9 @@ class Shortcode
             get_option("incontact-form-ph-email") .
             '" value="" required>
 			         <div class="invalid-feedback">
-			            Please enter your email address!
+			            ' .
+            esc_html__("Please enter your email address!", "in-contact") .
+            '
 			         </div>
 			      </div>
 			   </div>
@@ -277,7 +319,9 @@ class Shortcode
             get_option("incontact-form-ph-message") .
             '" required></textarea>
 			         <div class="invalid-feedback">
-			            Please enter your message!
+			            ' .
+            esc_html__("Please enter your message!", "in-contact") .
+            '
 			         </div>
 			      </div>
 			   </div>
@@ -292,7 +336,9 @@ class Shortcode
 			   <p></p>
 			      <div class="col-4">
 			         <button id="submit" name="submit" type="submit" value="Send" class="btn btn-primary">
-			         <i class="fas fa-paper-plane"></i> Send
+			         <i class="fas fa-paper-plane"></i> ' .
+            esc_html__("Send", "in-contact") .
+            '
 			         </button>
 			      </div>
 			   </div>
diff --git a/languages/in-contact-pl_PL.po b/languages/in-contact-pl_PL.po
new file mode 100644
index 0000000..3ee1681
--- /dev/null
+++ b/languages/in-contact-pl_PL.po
@@ -0,0 +1,133 @@
+msgid ""
+msgstr ""
+"Project-Id-Version: InContact 1.0.1\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2024-01-01 00:00+0000\n"
+"PO-Revision-Date: 2024-01-01 00:00+0000\n"
+"Last-Translator: \n"
+"Language-Team: Polish\n"
+"Language: pl_PL\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"X-Generator: manual\n"
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "InContact settings"
+msgstr "Ustawienia InContact"
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "InContact"
+msgstr "InContact"
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Settings saved!"
+msgstr "Ustawienia zostały zapisane!"
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "InContact - Settings"
+msgstr "InContact - Ustawienia"
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Site key"
+msgstr "Klucz witryny"
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Secret key"
+msgstr "Tajny klucz"
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Recipient (email)"
+msgstr "Adresat (email)"
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Form - placeholder name"
+msgstr "Formularz - placeholder nazwa"
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Form - placeholder email"
+msgstr "Formularz - placeholder email"
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Form - placeholder message"
+msgstr "Formularz - placeholder wiadomość"
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Form - label name"
+msgstr "Formularz - nazwa nazwa"
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Form - label email"
+msgstr "Formularz - nazwa email"
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Form - label message"
+msgstr "Formularz - nazwa wiadomość"
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Form - message sent successfully"
+msgstr "Formularz - wiadomość wysłana poprawnie"
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Save"
+msgstr "Zapisz"
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Please enter your name"
+msgstr "Wpisz swoje imię"
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Please enter your email address"
+msgstr "Wpisz swój adres email"
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Please enter your message"
+msgstr "Wpisz swoją wiadomość"
+
+#: inc/classes/inContact/Shortcode.php
+msgid "New message from contact form"
+msgstr "Nowa wiadomość z formularza kontaktowego"
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Contact details"
+msgstr "Dane kontaktowe"
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Name and surname"
+msgstr "Imię i nazwisko"
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Email"
+msgstr "Email"
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Message content"
+msgstr "Treść wiadomości"
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Reply to message"
+msgstr "Odpowiedz na wiadomość"
+
+#: inc/classes/inContact/Shortcode.php
+msgid "This email was generated automatically by the website contact form."
+msgstr "Ten e-mail został wygenerowany automatycznie przez formularz kontaktowy strony."
+
+#: inc/classes/inContact/Shortcode.php
+msgid "All rights reserved."
+msgstr "Wszelkie prawa zastrzeżone."
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Please enter your name!"
+msgstr "Podaj swoje imię!"
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Please enter your email address!"
+msgstr "Podaj swój adres email!"
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Please enter your message!"
+msgstr "Podaj swoją wiadomość!"
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Send"
+msgstr "Wyślij"
diff --git a/languages/in-contact.pot b/languages/in-contact.pot
new file mode 100644
index 0000000..2f5490b
--- /dev/null
+++ b/languages/in-contact.pot
@@ -0,0 +1,132 @@
+msgid ""
+msgstr ""
+"Project-Id-Version: InContact 1.0.1\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2024-01-01 00:00+0000\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: \n"
+"Language-Team: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"X-Generator: manual\n"
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "InContact settings"
+msgstr ""
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "InContact"
+msgstr ""
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Settings saved!"
+msgstr ""
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "InContact - Settings"
+msgstr ""
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Site key"
+msgstr ""
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Secret key"
+msgstr ""
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Recipient (email)"
+msgstr ""
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Form - placeholder name"
+msgstr ""
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Form - placeholder email"
+msgstr ""
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Form - placeholder message"
+msgstr ""
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Form - label name"
+msgstr ""
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Form - label email"
+msgstr ""
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Form - label message"
+msgstr ""
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Form - message sent successfully"
+msgstr ""
+
+#: inc/classes/inContact/AdminMenu.php
+msgid "Save"
+msgstr ""
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Please enter your name"
+msgstr ""
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Please enter your email address"
+msgstr ""
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Please enter your message"
+msgstr ""
+
+#: inc/classes/inContact/Shortcode.php
+msgid "New message from contact form"
+msgstr ""
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Contact details"
+msgstr ""
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Name and surname"
+msgstr ""
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Email"
+msgstr ""
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Message content"
+msgstr ""
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Reply to message"
+msgstr ""
+
+#: inc/classes/inContact/Shortcode.php
+msgid "This email was generated automatically by the website contact form."
+msgstr ""
+
+#: inc/classes/inContact/Shortcode.php
+msgid "All rights reserved."
+msgstr ""
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Please enter your name!"
+msgstr ""
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Please enter your email address!"
+msgstr ""
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Please enter your message!"
+msgstr ""
+
+#: inc/classes/inContact/Shortcode.php
+msgid "Send"
+msgstr ""