diff --git a/composer.json b/composer.json
index c576be4fbd0dff30773bfaabfffe9c29d8276691..193f1c953a0e4950f3a15268957e772c20ee9513 100644
--- a/composer.json
+++ b/composer.json
@@ -33,6 +33,8 @@
         "psr/log": "^1.1.0",
         "wpdesk/wp-persistence": "^3.0",
         "wpdesk/wp-view": "^2.0",
+        "wpdesk/wp-notice": "^3.1.1",
+        "wpdesk/wp-builder": "^2.0",
         "pelago/emogrifier": "7.0",
         "ext-json": "*"
     },
@@ -48,7 +50,13 @@
             "WPDesk\\Library\\WPEmail\\": "src"
         }
     },
-    "autoload-dev": {
+    "autoload-dev": {},
+    "extra": {
+        "text-domain": "wp-email",
+        "translations-folder": "lang",
+        "po-files": {
+            "pl_PL": "pl_PL.po"
+        }
     },
     "scripts": {
         "phpcs": "phpcs",
diff --git a/lang/pl_PL.po b/lang/pl_PL.po
new file mode 100644
index 0000000000000000000000000000000000000000..b385208d0f537f4fb33c4267bf4f4bc2c6980a3a
--- /dev/null
+++ b/lang/pl_PL.po
@@ -0,0 +1,357 @@
+msgid ""
+msgstr ""
+"Project-Id-Version: Plugin Template\n"
+"Report-Msgid-Bugs-To: https://wordpress.org/support/plugin/flexible-"
+"donation\n"
+"POT-Creation-Date: 2023-02-02 09:05+0100\n"
+"PO-Revision-Date: 2023-02-02 09:05+0100\n"
+"Last-Translator: Krzysztof Dyszczyk <krzysztof.dyszczyk@gmail.com>\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"
+"Plural-Forms: nplurals=3; plural=(n==1 ? 0 : n%10 >= 2 && n%10<=4 &&(n"
+"%100<10||n%100 >= 20)? 1 : 2);\n"
+"Plural-Forms: nplurals=3; plural=(n==1 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 "
+"|| n%100>=20) ? 1 : 2);\n"
+"X-Generator: Poedit 3.2.2\n"
+"X-Loco-Version: 2.3.0; wp-5.2.2X-Poedit-Basepath: ..\n"
+"X-Poedit-SourceCharset: UTF-8\n"
+"X-Poedit-KeywordsList: __;_e;_n:1,2;_x:1,2c;_ex:1,2c;_nx:4c,1,2;esc_attr__;"
+"esc_attr_e;esc_attr_x:1,2c;esc_html__;esc_html_e;esc_html_x:1,2c;_n_noop:1,2;"
+"_nx_noop:3c,1,2;__ngettext_noop:1,2\n"
+"X-Poedit-Basepath: ..\n"
+"X-Poedit-SearchPath-0: .\n"
+"X-Poedit-SearchPathExcluded-0: *.js\n"
+"X-Poedit-SearchPathExcluded-1: vendor\n"
+"X-Poedit-SearchPathExcluded-2: vendor_prefixed\n"
+
+#~ msgid "Flexible Donation"
+#~ msgstr "Elastyczne Darowizny"
+
+#~ msgid "Create a donation form in conjunction with popular payment gateways"
+#~ msgstr ""
+#~ "Utwórz formularz darowizny w połączeniu z popularnymi bramkami płatności"
+
+#~ msgid "Settings"
+#~ msgstr "Ustawienia"
+
+#~ msgid "Support"
+#~ msgstr "Wsparcie"
+
+#~ msgid "Amount"
+#~ msgstr "Kwota"
+
+#~ msgid "Payment status"
+#~ msgstr "Status płatności"
+
+#~ msgid "Payment method"
+#~ msgstr "Metoda płatności"
+
+#~ msgid "Form"
+#~ msgstr "Formularz"
+
+#~ msgid "%s PLN"
+#~ msgstr "%s PLN"
+
+#~ msgid "Unknown"
+#~ msgstr "Nieznany"
+
+#~ msgid "Donation data"
+#~ msgstr "Dane darowizny"
+
+#~ msgid "Form settings"
+#~ msgstr "Ustawienia formularza"
+
+#~ msgid "I accept terms & conditions"
+#~ msgstr "AkceptujÄ™ regulamin darowizn"
+
+#~ msgid "First name"
+#~ msgstr "ImiÄ™"
+
+#~ msgid "Last name"
+#~ msgstr "Nazwisko"
+
+#~ msgid "E-mail"
+#~ msgstr "E-mail"
+
+#~ msgid "Comment"
+#~ msgstr "Komentarz"
+
+#~ msgid "Terms"
+#~ msgstr "Regulamin"
+
+#~ msgid "Send donation"
+#~ msgstr "Wyślij darowiznę"
+
+#~ msgid "terms & conditions"
+#~ msgstr "regulamin"
+
+#~ msgid "Bank transfer"
+#~ msgstr "Przelew bankowy"
+
+#~ msgid "Bank Transfer Settings"
+#~ msgstr "Ustawienia przelewu bankowego"
+
+#~ msgid "Recipient data"
+#~ msgstr "Dane odbiorcy"
+
+#~ msgid "Company name, street, street number, post code, city etc."
+#~ msgstr "Nazwa firmy, ulica, numer ulicy, kod pocztowy, miasto itp."
+
+#~ msgid "Account number"
+#~ msgstr "Nr konta"
+
+#~ msgid "Bank name"
+#~ msgstr "Nazwa banku"
+
+#~ msgid "Payment title"
+#~ msgstr "Tytuł płatności"
+
+#~ msgid "SWIFT"
+#~ msgstr "SWIFT"
+
+#~ msgid "Sort code"
+#~ msgstr "Sort code"
+
+#~ msgid "Description"
+#~ msgstr "Opis"
+
+#~ msgid ""
+#~ "Please pay directly to our bank account. Please use defined payment title "
+#~ "as the payment title. Your order will be processed after the payment is "
+#~ "credited to our account."
+#~ msgstr ""
+#~ "Prosimy o wpłatę bezpośrednio na nasze konto bankowe. Jako tytuł "
+#~ "płatności proszę użyć numeru zamówienia. Twoje zamówienie zostanie "
+#~ "zrealizowane po zaksięgowaniu wpłaty na naszym koncie."
+
+#~ msgid "PayU"
+#~ msgstr "PayU"
+
+#~ msgid "Niepoprawne zamówienie PayU!"
+#~ msgstr "Niepoprawne zamówienie PayU!"
+
+#~ msgid "Payu Settings"
+#~ msgstr "Ustawienia PayU"
+
+#~ msgid "POS ID"
+#~ msgstr "POS ID"
+
+#~ msgid "MD5"
+#~ msgstr "MD5"
+
+#~ msgid "Client ID"
+#~ msgstr "Client ID"
+
+#~ msgid "Client secret"
+#~ msgstr "Client secret"
+
+#~ msgid "Currency"
+#~ msgstr "Waluta"
+
+#~ msgid "Is sandbox"
+#~ msgstr "WÅ‚Ä…cz sanbox"
+
+#~ msgid "%1$s, Darowizna %2$s"
+#~ msgstr "%1$s, Darowizna %2$s"
+
+#~ msgid "Darowizna nr %s"
+#~ msgstr "Darowizna nr %s"
+
+#~ msgid "Donations"
+#~ msgstr "Darowizny"
+
+#~ msgid "Donation"
+#~ msgstr "Darowizna"
+
+#~ msgid "Not donations found."
+#~ msgstr "Nie znaleziono darowizn."
+
+#~ msgid "Forms"
+#~ msgstr "Formularze"
+
+#~ msgid "Not forms found."
+#~ msgstr "Nie znaleziono formularzy."
+
+#~ msgid "Donation Summary"
+#~ msgstr "Podsumowanie Darowizny"
+
+#~ msgid "Pending"
+#~ msgstr "OczekujÄ…cy"
+
+#~ msgid "Completed"
+#~ msgstr "Opłacone"
+
+#~ msgid "Failed"
+#~ msgstr "Anulowane"
+
+#~ msgid "Save Changes"
+#~ msgstr "Zapisz zmiany"
+
+#~ msgid "Summary Page"
+#~ msgstr "Strona podsumowania"
+
+#~ msgid "Select or create summary page."
+#~ msgstr "Wybierz stronÄ™ podsumowania."
+
+#~ msgid "Summary Page Content"
+#~ msgstr "Treść strony podsumowania"
+
+#~ msgid "This content will be displayed on summary page."
+#~ msgstr "Ta treść pojawi się na stronie podsumowania."
+
+#~ msgid "Customer e-mail"
+#~ msgstr "E-mail darczyńcy"
+
+#~ msgid "Enable"
+#~ msgstr "WÅ‚Ä…cz"
+
+#~ msgid "Subject"
+#~ msgstr "Temat"
+
+#~ msgid "[{site_title}]: Your donation has been made"
+#~ msgstr "[{site_title}]: Twoja darowizna została przekazana"
+
+#~ msgid "Email heading"
+#~ msgstr "Nagłówek maila"
+
+#~ msgid "Thank you for donating"
+#~ msgstr "Dziękujemy za darowiznę"
+
+#~ msgid "Email body"
+#~ msgstr "Treść maila"
+
+#~ msgid ""
+#~ "Hi {donation_first_name},<br/><br/>Thank you for your donation of "
+#~ "£{donation_amount}.<br/><br/>{donate_summary_table}"
+#~ msgstr ""
+#~ "Cześć {donation_first_name},<br/><br/>Dziękujemy za darowiznę w kwocie "
+#~ "{donation_amount}zł.<br/><br/>{donate_summary_table}"
+
+#~ msgid "Admin e-mail"
+#~ msgstr "E-mail administratora"
+
+#~ msgid ""
+#~ "Hi Admin,<br/><br/>A new donation in the amount of £{donation_amount} has "
+#~ "been received.<br/><br/>You can check the details <a href="
+#~ "\"{donation_url}\">here</a>.<br/><br/>{donation_summary_table}"
+#~ msgstr ""
+#~ "Cześć Admin,<br/><br/>Nowa darowizna w kwocie {donation_amount}zł została "
+#~ "przekazana.<br/><br/>Sprawdź szczegóły <a href=\"{donation_url}\">tutaj</"
+#~ "a>.<br/><br/>{donation_summary_table}"
+
+#~ msgid "User Price"
+#~ msgstr "Kwota użytkownika"
+
+#~ msgid "Minimum price:"
+#~ msgstr "Kwota minimalna:"
+
+#~ msgid "Preset Prices"
+#~ msgstr "Zdefiniowane ceny"
+
+#~ msgid "Add item"
+#~ msgstr "Dodaj wartość"
+
+#~ msgid "Remove item"
+#~ msgstr "Usuń wartość"
+
+#~ msgid "Terms and Conditions"
+#~ msgstr "Regulamin"
+
+#~ msgid "Show terms and conditions"
+#~ msgstr "Pokaż regulamin użytkownika"
+
+#~ msgid "Link label:"
+#~ msgstr "Etykieta linku:"
+
+#~ msgid "Terms page:"
+#~ msgstr "Strona z warunkami:"
+
+#~ msgid "Payment methods"
+#~ msgstr "Metody płatności"
+
+#~ msgid "First name:"
+#~ msgstr "ImiÄ™:"
+
+#~ msgid "Last name:"
+#~ msgstr "Nazwisko:"
+
+#~ msgid "E-mail:"
+#~ msgstr "E-mail:"
+
+#~ msgid "Amount:"
+#~ msgstr "Kwota:"
+
+#~ msgid "Comment:"
+#~ msgstr "Komentarz:"
+
+#~ msgid "Payment method:"
+#~ msgstr "Metoda płatności:"
+
+#~ msgid "Payment status:"
+#~ msgstr "Status płatności:"
+
+#~ msgid "Sort Code"
+#~ msgstr "Sort Code"
+
+#~ msgid "Donation details"
+#~ msgstr "Szczegóły darowizny"
+
+#~ msgid "Thank You Page"
+#~ msgstr "Strona podziękowania"
+
+#~ msgid "Minimum amount"
+#~ msgstr "Minimalna kwota"
+
+#~ msgid "Set minimum amount. Default: 1."
+#~ msgstr "Ustaw kwotę minimalną. Domyślnie 10."
+
+#~ msgid "Maximum amount"
+#~ msgstr "Maksymalna kwota"
+
+#~ msgid "Set maximum amount or leave empty."
+#~ msgstr "Ustaw kwotÄ™ maksymalnÄ… lub pozostaw puste."
+
+#~ msgid "Purposes"
+#~ msgstr "Cele"
+
+#~ msgid "Purpose"
+#~ msgstr "Cek"
+
+#~ msgid "Search Purpose"
+#~ msgstr "Szukaj celu"
+
+#~ msgid "Popular Purposes"
+#~ msgstr "Popularne cele"
+
+#~ msgid "All Purposes"
+#~ msgstr "Wszystki cele"
+
+#~ msgid "Edit Purposes"
+#~ msgstr "Edytuj cel"
+
+#~ msgid "Update Purposes"
+#~ msgstr "Aktualizuj cel"
+
+#~ msgid "Add New Purposes"
+#~ msgstr "Dodaj nowy cel"
+
+#~ msgid "New Purpose Name"
+#~ msgstr "Nazwa celu"
+
+#~ msgid "Add or remove purposes"
+#~ msgstr "Dodaj lub usuń cele"
+
+#~ msgid "Choose from the most used purposes"
+#~ msgstr "Wybierz jeden z najczęściej używanych celów"
+
+#~ msgid "No purposes found."
+#~ msgstr "Nie znaleziono celów."
+
+#~ msgid "Enable email."
+#~ msgstr "WÅ‚Ä…cz powiadomienie."
+
+#~ msgid "Define prices:"
+#~ msgstr "Zdefiniuj ceny"