diff --git a/lang/ca.php b/lang/ca.php
index 135caae..84f407d 100644
--- a/lang/ca.php
+++ b/lang/ca.php
@@ -101,9 +101,14 @@ $lang["edituser"] = "Editar usuari";
 $lang["servererror"] = "Error del servidor";
 $lang["allrequired"] = "Tots els camps són necessaris";
 $lang["passnotmatch"] = "Les contrasenyes no coincideixen";
+$lang["oldpassinvalid"] = "Wrong old password";
+$lang["passempty"] = "Empty password";
+$lang["loginempty"] = "Empty login";
+$lang["passstrengthwarn"] = "Invalid password strength";
 $lang["actionsuccess"] = "Acció completada correctament";
 $lang["actionfailure"] = "Hi ha hagut un error";
 $lang["notauthorized"] = "Usuari no autoritzat";
+$lang["userunknown"] = "User unknown";
 $lang["userdelwarn"] = "Precaució!\n\nEsborraràs permanentement l'usuari %s, totes les seves rutes i posicions.\n\nEstàs segur?"; // substitutes user login
 $lang["editinguser"] = "Estàs editant l'usuari %s"; // substitutes user login
 $lang["selfeditwarn"] = "No pots editar el teu propi usuari";
diff --git a/lang/cs.php b/lang/cs.php
index f63cc21..f2af5b1 100644
--- a/lang/cs.php
+++ b/lang/cs.php
@@ -101,9 +101,14 @@ $lang["edituser"] = "Upravit uživatele";
 $lang["servererror"] = "Chyba serveru";
 $lang["allrequired"] = "Všechna pole jsou povinná";
 $lang["passnotmatch"] = "Hesla neodpovídají";
+$lang["oldpassinvalid"] = "Chybné původní heslo";
+$lang["passempty"] = "Prázdné heslo";
+$lang["loginempty"] = "Prázdný login";
+$lang["passstrengthwarn"] = "Neplatná síla hesla";
 $lang["actionsuccess"] = "Akce úspěšně dokončena";
 $lang["actionfailure"] = "Něco se pokazilo";
 $lang["notauthorized"] = "Uživatel není oprávněn";
+$lang["userunknown"] = "Uživatel neznámý";
 $lang["userdelwarn"] = "Upozornění:\n\nTrvale smažete uživatele %s spolu se všemi jeho trasami a pozicemi.\n\nJste si jist?"; // substitutes user login
 $lang["editinguser"] = "Upravujete uživatele %s"; // substitutes user login
 $lang["selfeditwarn"] = "Pomocí tohoto nástroje nemůžete upravovat vlastního uživatele";
diff --git a/lang/de.php b/lang/de.php
index 14dc058..21b12f2 100644
--- a/lang/de.php
+++ b/lang/de.php
@@ -102,9 +102,14 @@ $lang["edituser"] = "Benutzer bearbeiten";
 $lang["servererror"] = "Serverfehler";
 $lang["allrequired"] = "Alle Felder müssen ausgefüllt werden";
 $lang["passnotmatch"] = "Passwörter stimmen nicht überein!";
+$lang["oldpassinvalid"] = "Wrong old password";
+$lang["passempty"] = "Empty password";
+$lang["loginempty"] = "Empty login";
+$lang["passstrengthwarn"] = "Invalid password strength";
 $lang["actionsuccess"] = "Aktion erfolgreich abgeschlossen";
 $lang["actionfailure"] = "Da ist etwas schief gelaufen";
 $lang["notauthorized"] = "Für diesen Benutzer nicht zugelassen";
+$lang["userunknown"] = "User unknown";
 $lang["userdelwarn"] = "Achtung!\n\nDer Benutzer %s und all seine Routen werden endgültig gelöscht!\n\nBist Du sicher?"; // substitutes user login
 $lang["editinguser"] = "Du bearbeitest Benutzer %s"; // substitutes user login
 $lang["selfeditwarn"] = "Du kannst deinen eigenen Benutzer nicht bearbeiten.";
diff --git a/lang/es.php b/lang/es.php
index 1af88f6..edda01d 100644
--- a/lang/es.php
+++ b/lang/es.php
@@ -101,9 +101,14 @@ $lang["edituser"] = "Editar usuario";
 $lang["servererror"] = "Error del servidor";
 $lang["allrequired"] = "Todos los campos son necesarios";
 $lang["passnotmatch"] = "Las contraseñas no coinciden";
+$lang["oldpassinvalid"] = "Wrong old password";
+$lang["passempty"] = "Empty password";
+$lang["loginempty"] = "Empty login";
+$lang["passstrengthwarn"] = "Invalid password strength";
 $lang["actionsuccess"] = "Acción completada correctamente";
 $lang["actionfailure"] = "Ha ocurrido un error";
 $lang["notauthorized"] = "Usuario no autorizado";
+$lang["userunknown"] = "User unknown";
 $lang["userdelwarn"] = "Precaución!\n\nVas a eliminar permanentemente al usuario %s, junto con todas sus rutas y posiciones.\n\n¿Estás seguro?"; // substitutes user login
 $lang["editinguser"] = "Estás editando el usuario %s"; // substitutes user login
 $lang["selfeditwarn"] = "No puedes editar tu propio usuario";
diff --git a/lang/eu.php b/lang/eu.php
index 1c0e752..766d1eb 100644
--- a/lang/eu.php
+++ b/lang/eu.php
@@ -101,9 +101,14 @@ $lang["edituser"] = "Erabiltzailea editatu";
 $lang["servererror"] = "Zerbitzari errorea";
 $lang["allrequired"] = "Eremu guztiak derrigorrezkoak dira";
 $lang["passnotmatch"] = "Pasahitzek ez dute bat egiten";
+$lang["oldpassinvalid"] = "Wrong old password";
+$lang["passempty"] = "Empty password";
+$lang["loginempty"] = "Empty login";
+$lang["passstrengthwarn"] = "Invalid password strength";
 $lang["actionsuccess"] = "Ekintza arrakastaz burutu da";
 $lang["actionfailure"] = "Zerbait gaizki joan da";
 $lang["notauthorized"] = "Erabiltzeak ez du baimenik";
+$lang["userunknown"] = "User unknown";
 $lang["userdelwarn"] = "Adi!\n\n%serabiltzailea behin-betiko ezabatzera zoaz, bere ibilbide guztiekin eta posizio guztiekin batera.\n\nZiur zaude?"; // substitutes user login
 $lang["editinguser"] = "%s erabiltzailea editatzen ari zara"; // substitutes user login
 $lang["selfeditwarn"] = "Erreminta honekin ezin duzu zure erabiltzailea editatu";
diff --git a/lang/fr.php b/lang/fr.php
index 037ada5..65e0d91 100644
--- a/lang/fr.php
+++ b/lang/fr.php
@@ -101,9 +101,14 @@ $lang["edituser"] = "Modifier l'utilisateur";
 $lang["servererror"] = "Erreur serveur";
 $lang["allrequired"] = "Tous les champs sont requis";
 $lang["passnotmatch"] = "Les mots de passe sont différents";
+$lang["oldpassinvalid"] = "Wrong old password";
+$lang["passempty"] = "Empty password";
+$lang["loginempty"] = "Empty login";
+$lang["passstrengthwarn"] = "Invalid password strength";
 $lang["actionsuccess"] = "Action effectuée avec succès";
 $lang["actionfailure"] = "Echec de l'action";
 $lang["notauthorized"] = "Utilisateur non autorisé";
+$lang["userunknown"] = "User unknown";
 $lang["userdelwarn"] = "Attention !\n\nVous êtes sur le point de supprimer de manière permanente l'utilisateur %s ainsi que toutes ses traces et positions.\n\nÊtes-vous certain ?"; // substitutes user login
 $lang["editinguser"] = "Vous êtes en train d'éditer l'utilisateur %s"; // substitutes user login
 $lang["selfeditwarn"] = "Vous ne pouvez pas éditer votre propre utilisateur de cette manière";
diff --git a/lang/hu.php b/lang/hu.php
index 6f877d6..b8525bf 100644
--- a/lang/hu.php
+++ b/lang/hu.php
@@ -101,9 +101,14 @@ $lang["edituser"] = "Edit user";
 $lang["servererror"] = "Server error";
 $lang["allrequired"] = "All fields are required";
 $lang["passnotmatch"] = "Passwords don't match";
+$lang["oldpassinvalid"] = "Wrong old password";
+$lang["passempty"] = "Empty password";
+$lang["loginempty"] = "Empty login";
+$lang["passstrengthwarn"] = "Invalid password strength";
 $lang["actionsuccess"] = "Action completed successfully";
 $lang["actionfailure"] = "Something went wrong";
 $lang["notauthorized"] = "User not authorized";
+$lang["userunknown"] = "User unknown";
 $lang["userdelwarn"] = "Warning!\n\nYou are going to permanently delete user %s, together with all their routes and positions.\n\nAre you sure?"; // substitutes user login
 $lang["editinguser"] = "You are editing user %s"; // substitutes user login
 $lang["selfeditwarn"] = "Your can't edit your own user with this tool";
diff --git a/lang/it.php b/lang/it.php
index 9fdca63..2e7fbf3 100644
--- a/lang/it.php
+++ b/lang/it.php
@@ -101,9 +101,14 @@ $lang["edituser"] = "Modifica utente";
 $lang["servererror"] = "Errore del server";
 $lang["allrequired"] = "Tutti i campi sono obbligatori";
 $lang["passnotmatch"] = "Le password sono diverse";
+$lang["oldpassinvalid"] = "Wrong old password";
+$lang["passempty"] = "Empty password";
+$lang["loginempty"] = "Empty login";
+$lang["passstrengthwarn"] = "Invalid password strength";
 $lang["actionsuccess"] = "Completato con successo";
 $lang["actionfailure"] = "Qualcosa è andato storto";
 $lang["notauthorized"] = "Utente non autorizzato";
+$lang["userunknown"] = "User unknown";
 $lang["userdelwarn"] = "Attenzione!\n\nStai eliminando permanentemente l'utente %s, con tutte le tracce e le posizioni.\n\nSei sicuro?"; // substitutes user login
 $lang["editinguser"] = "Stai modificando l'utente %s"; // substitutes user login
 $lang["selfeditwarn"] = "Non puoi modificare il tuo utente con questo strumento";
diff --git a/lang/nl.php b/lang/nl.php
index af1d9d5..3518569 100644
--- a/lang/nl.php
+++ b/lang/nl.php
@@ -101,9 +101,14 @@ $lang["edituser"] = "Verander Gebruiker";
 $lang["servererror"] = "Server fout";
 $lang["allrequired"] = "Alle velden zijn benodigd";
 $lang["passnotmatch"] = "Passwords zijn niet gelijk";
+$lang["oldpassinvalid"] = "Wrong old password";
+$lang["passempty"] = "Empty password";
+$lang["loginempty"] = "Empty login";
+$lang["passstrengthwarn"] = "Invalid password strength";
 $lang["actionsuccess"] = "Actie succesvol afgerond";
 $lang["actionfailure"] = "Iets ging verkeerd";
 $lang["notauthorized"] = "User not authorized";
+$lang["userunknown"] = "User unknown";
 $lang["userdelwarn"] = "Pas op!\n\nJe gaat definitief gebruiker %s weghalen, inclusief alle routes en tracks.\n\nWeet je het zeker?"; // substitutes user login
 $lang["editinguser"] = "Je bent gebruiker %s aan het veranderen"; // substitutes user login
 $lang["selfeditwarn"] = "Je kunt niet je eigen gebruiker hier veranderen";
diff --git a/lang/pl.php b/lang/pl.php
index dbb3a1d..2aee89a 100644
--- a/lang/pl.php
+++ b/lang/pl.php
@@ -101,9 +101,14 @@ $lang["edituser"] = "Edytuj użytkownika";
 $lang["servererror"] = "Błąd serwera";
 $lang["allrequired"] = "Wszystkie pola są wymagane";
 $lang["passnotmatch"] = "Hasła nie pasują do siebie";
+$lang["oldpassinvalid"] = "Nieprawidłowe stare hasło";
+$lang["passempty"] = "Puste hasło";
+$lang["loginempty"] = "Pusty login";
+$lang["passstrengthwarn"] = "Niewystarczająca siła hasła";
 $lang["actionsuccess"] = "Operacja zakończona pomyślnie";
 $lang["actionfailure"] = "Wystąpił błąd";
 $lang["notauthorized"] = "Brak autoryzacji";
+$lang["userunknown"] = "Nieznany użytkownik";
 $lang["userdelwarn"] = "Uwaga!\n\nTa operacja nieodwracalnie usunie użytkownika %s wraz ze wszystkimi jego trasami i pozycjami.\n\nCzy na pewno?"; // substitutes user login
 $lang["editinguser"] = "Edytujesz użytkownika %s"; // substitutes user login
 $lang["selfeditwarn"] = "Nie można edytować własnego użytkownika za pomocą tego narzędzia";
diff --git a/lang/ru.php b/lang/ru.php
index 47e170f..685f296 100644
--- a/lang/ru.php
+++ b/lang/ru.php
@@ -101,9 +101,14 @@ $lang["edituser"] = "Редактировать пользователя";
 $lang["servererror"] = "Серверная ошибка";
 $lang["allrequired"] = "Все поля необходимы для заполнения";
 $lang["passnotmatch"] = "Пароли не совпадают";
+$lang["oldpassinvalid"] = "Wrong old password";
+$lang["passempty"] = "Empty password";
+$lang["loginempty"] = "Empty login";
+$lang["passstrengthwarn"] = "Invalid password strength";
 $lang["actionsuccess"] = "Выполнено успешно";
 $lang["actionfailure"] = "Что-то пошло не так";
 $lang["notauthorized"] = "Пользователь не авторизован";
+$lang["userunknown"] = "User unknown";
 $lang["userdelwarn"] = "Внимание!\n\nВы хотите безвозвратно удалить пользователя %s, вместе со всеми его треками и локациями.\n\nВы уверены?"; // substitutes user login
 $lang["editinguser"] = "Вы редактируете пользователя %s"; // substitutes user login
 $lang["selfeditwarn"] = "Вы не можете редактировать ваших собственных пользователей при помощи этого инструмента";
diff --git a/lang/sk.php b/lang/sk.php
index 13790c5..539afa0 100644
--- a/lang/sk.php
+++ b/lang/sk.php
@@ -101,9 +101,14 @@ $lang["edituser"] = "Upraviť používateľa";
 $lang["servererror"] = "Chyba servera";
 $lang["allrequired"] = "Všetky polia sú povinné";
 $lang["passnotmatch"] = "Heslá sa nezhodujú";
+$lang["oldpassinvalid"] = "Wrong old password";
+$lang["passempty"] = "Empty password";
+$lang["loginempty"] = "Empty login";
+$lang["passstrengthwarn"] = "Invalid password strength";
 $lang["actionsuccess"] = "Akcia bola úspešne vykonaná";
 $lang["actionfailure"] = "Niečo nevyšlo";
 $lang["notauthorized"] = "Používateľ nebol autorizovaný";
+$lang["userunknown"] = "User unknown";
 $lang["userdelwarn"] = "Upozornenie!\n\nChystáte sa nenávratne odstrániť používateľa %s spolu s jeho cestami a miestami.\n\nSte si istý?"; // substitutes user login
 $lang["editinguser"] = "Upravujete používateľa %s"; // substitutes user login
 $lang["selfeditwarn"] = "Týmto nástrojom nemôžete upravovať samého seba";
diff --git a/lang/zh.php b/lang/zh.php
index c332f9c..09ea69b 100644
--- a/lang/zh.php
+++ b/lang/zh.php
@@ -101,9 +101,14 @@ $lang["edituser"] = "修改用戶";
 $lang["servererror"] = "服務器發生錯誤";
 $lang["allrequired"] = "所有欄目均為必填";
 $lang["passnotmatch"] = "密碼不匹配";
+$lang["oldpassinvalid"] = "Wrong old password";
+$lang["passempty"] = "Empty password";
+$lang["loginempty"] = "Empty login";
+$lang["passstrengthwarn"] = "Invalid password strength";
 $lang["actionsuccess"] = "完成";
 $lang["actionfailure"] = "失敗";
 $lang["notauthorized"] = "User not authorized";
+$lang["userunknown"] = "User unknown";
 $lang["userdelwarn"] = "注意！\n\n您即將永久刪除用戶 %s 以及他/她的所有路徑和位置資料。\n\n確定刪除嗎？"; // substitutes user login
 $lang["editinguser"] = "您正在編輯用戶 %s"; // substitutes user login
 $lang["selfeditwarn"] = "您不能用此工具編輯您的用戶";