diff --git a/modules/backend/assets/js/october-min.js b/modules/backend/assets/js/october-min.js
index a699dd805..0b899036b 100644
--- a/modules/backend/assets/js/october-min.js
+++ b/modules/backend/assets/js/october-min.js
@@ -5061,7 +5061,9 @@ data[option].apply(data,methodArgs)}})}
 $.fn.sidenavTree.Constructor=SidenavTree
 $.fn.sidenavTree.noConflict=function(){$.fn.sidenavTree=old
 return this}
-$(document).ready(function(){$('[data-control=sidenav-tree]').sidenavTree()})}(window.jQuery);$(window).on('ajaxErrorMessage',function(event,message){if(!message)return
+$(document).ready(function(){$('[data-control=sidenav-tree]').sidenavTree()})}(window.jQuery);$.ajaxPrefilter(function(options){var token=$('meta[name="csrf-token"]').attr('content')
+if(token){options.headers['X-CSRF-TOKEN']=token}})
+$(window).on('ajaxErrorMessage',function(event,message){if(!message)return
 swal({title:message,confirmButtonClass:'btn-default'})
 event.preventDefault()})
 $(window).on('ajaxConfirmMessage',function(event,message){if(!message)return
diff --git a/modules/backend/formwidgets/FileUpload.php b/modules/backend/formwidgets/FileUpload.php
index aad122e85..176abff48 100644
--- a/modules/backend/formwidgets/FileUpload.php
+++ b/modules/backend/formwidgets/FileUpload.php
@@ -35,7 +35,7 @@ class FileUpload extends FormWidgetBase
     /**
      * @var string Prompt to display if no record is selected.
      */
-    public $prompt = 'Click the %s or drag a file here to upload';
+    public $prompt = 'backend::lang.fileupload.default_prompt';
 
     /**
      * @var int Preview image width
@@ -47,11 +47,6 @@ class FileUpload extends FormWidgetBase
      */
     public $imageHeight = null;
 
-    /**
-     * @var string Text to display when no file is associated
-     */
-    public $previewNoFilesMessage = 'backend::lang.form.preview_no_files_message';
-
     /**
      * @var mixed Collection of acceptable file types.
      */
@@ -93,7 +88,6 @@ class FileUpload extends FormWidgetBase
             'prompt',
             'imageWidth',
             'imageHeight',
-            'previewNoFilesMessage',
             'fileTypes',
             'mimeTypes',
             'thumbOptions',
@@ -126,7 +120,7 @@ class FileUpload extends FormWidgetBase
         $this->vars['acceptedFileTypes'] = $this->getAcceptedFileTypes(true);
         $this->vars['cssDimensions'] = $this->getCssDimensions();
         $this->vars['useCaption'] = $this->useCaption;
-        $this->vars['prompt'] = str_replace('%s', '<i class="icon-upload"></i>', $this->prompt);
+        $this->vars['prompt'] = str_replace('%s', '<i class="icon-upload"></i>', trans($this->prompt));
     }
 
     protected function getFileList()
diff --git a/modules/backend/lang/de/lang.php b/modules/backend/lang/de/lang.php
index e696b38c2..ffa4a3d01 100644
--- a/modules/backend/lang/de/lang.php
+++ b/modules/backend/lang/de/lang.php
@@ -156,7 +156,6 @@ return [
         'or' => 'or',
         'confirm_tab_close' => 'Wollen Sie den Tab wirklich schließen? Ungespeicherte Änderungen gehen verloren.',
         'behavior_not_ready' => 'Formularverhalten kann nicht initialisiert werden, überprüfen Sie den Aufruf von makeLists() in Ihrem Controller.',
-        'preview_no_files_message' => 'Keine Dateien wurden hochgeladen',
         'select' => 'Auswählen',
         'select_all' => 'Alle',
         'select_none' => 'Keine',
diff --git a/modules/backend/lang/en/lang.php b/modules/backend/lang/en/lang.php
index f9015d2e9..8eac78da1 100644
--- a/modules/backend/lang/en/lang.php
+++ b/modules/backend/lang/en/lang.php
@@ -143,7 +143,8 @@ return [
         'attachment' => 'Attachment',
         'help' => 'Add a title and description for this attachment.',
         'title_label' => 'Title',
-        'description_label' => 'Description'
+        'description_label' => 'Description',
+        'default_prompt' => 'Click the %s or drag a file here to upload'
     ],
     'form' => [
         'create_title' => 'New :name',
@@ -184,7 +185,6 @@ return [
         'or' => 'or',
         'confirm_tab_close' => 'Do you really want to close the tab? Unsaved changes will be lost.',
         'behavior_not_ready' => 'Form behavior has not been initialized, check that you have called initForm() in your controller.',
-        'preview_no_files_message' => 'Files are not uploaded',
         'select' => 'Select',
         'select_all' => 'all',
         'select_none' => 'none',
diff --git a/modules/backend/lang/es-ar/lang.php b/modules/backend/lang/es-ar/lang.php
index e8e401b95..621ddea23 100644
--- a/modules/backend/lang/es-ar/lang.php
+++ b/modules/backend/lang/es-ar/lang.php
@@ -159,7 +159,6 @@ return [
         'or' => 'o',
         'confirm_tab_close' => '¿Realmente desea cerrar la cuenta? Se perderán los cambios no guardados.',
         'behavior_not_ready' => 'Favor compruebe que ha llamado a la funcion initForm() en el controlador.',
-        'preview_no_files_message' => 'Los archivos no fueron cargados',
         'select' => 'Seleccionar',
         'select_all' => 'Todo',
         'select_none' => 'Nada',
diff --git a/modules/backend/lang/es/lang.php b/modules/backend/lang/es/lang.php
index 5d1447534..3ebecc4a1 100644
--- a/modules/backend/lang/es/lang.php
+++ b/modules/backend/lang/es/lang.php
@@ -161,7 +161,6 @@ return [
         'or'                       => 'o',
         'confirm_tab_close'        => '¿Realmente desea cerrar la pestaña? Se perderán los cambios no guardados.',
         'behavior_not_ready'       => 'El comportamiento del formulario no se ha inicializado, compruebe que ha llamado initForm() en el controlador.',
-        'preview_no_files_message' => 'Los archivos no se han subido',
         'select'                   => 'Seleccionar',
         'select_all'               => 'todos',
         'select_none'              => 'ninguno',
diff --git a/modules/backend/lang/fa/lang.php b/modules/backend/lang/fa/lang.php
index 9223020c1..211319db8 100644
--- a/modules/backend/lang/fa/lang.php
+++ b/modules/backend/lang/fa/lang.php
@@ -167,7 +167,6 @@ return [
         'or'                                   => 'یا',
         'confirm_tab_close'                    => 'در صورت بستن این پنجره موارد ذخیره نشده از بین خواهند رفت. آیا از حذف شدن این پنجره اطمینان دارید؟',
         'behavior_not_ready'                   => 'فرم مور نظر مقدار دهی اولیه نشده است ، بررسی کنید که متد initForm() در کنترلر فرتخوانی شده باشد.',
-        'preview_no_files_message'             => 'فایل ها ارسال نشدند',
         'select'                               => 'انتخاب',
         'select_all'                           => 'همه',
         'select_none'                          => 'هیچ',
diff --git a/modules/backend/lang/fr/lang.php b/modules/backend/lang/fr/lang.php
index 58271ea19..d7ead07d5 100644
--- a/modules/backend/lang/fr/lang.php
+++ b/modules/backend/lang/fr/lang.php
@@ -180,7 +180,6 @@ return [
         'or' => 'ou',
         'confirm_tab_close' => 'Confirmer la fermeture de cet onglet ? Les modifications réalisées seront perdues.',
         'behavior_not_ready' => 'Le formulaire n’a pas encore été initialisé, vérifier que la méthode d’appel de initForm() a été soumise au contrôleur.',
-        'preview_no_files_message' => 'Les fichiers ne sont pas envoyés.',
         'select' => 'Sélectionner',
         'select_all' => 'tout',
         'select_none' => 'aucun',
diff --git a/modules/backend/lang/hu/lang.php b/modules/backend/lang/hu/lang.php
index c1dbc8324..1ae9aa6a9 100644
--- a/modules/backend/lang/hu/lang.php
+++ b/modules/backend/lang/hu/lang.php
@@ -180,7 +180,6 @@ return [
         'or' => 'vagy',
         'confirm_tab_close' => 'Valóban be akarja zárni a fület? El fognak veszni a nem mentett módosítások.',
         'behavior_not_ready' => 'Nem történt meg az űrlapviselkedés inicializálása, ellenőrizze, hogy meghívta-e az initForm() függvényt a vezérlőben.',
-        'preview_no_files_message' => 'A fájlok nincsenek feltöltve',
         'select' => 'Válasszon',
         'select_all' => 'mind',
         'select_none' => 'egyik sem',
diff --git a/modules/backend/lang/id/lang.php b/modules/backend/lang/id/lang.php
index f858c4709..83093930d 100644
--- a/modules/backend/lang/id/lang.php
+++ b/modules/backend/lang/id/lang.php
@@ -180,7 +180,6 @@ return [
         'or' => 'atau',
         'confirm_tab_close' => 'Anda yakin akan menutup tab? Perubahan belum tersimpan akan hilang.',
         'behavior_not_ready' => 'Behavior borang belum diinisialisasi, periksa apakah Anda telah memanggil initForm() pada controller Anda.',
-        'preview_no_files_message' => 'Berkas tidak terunggah',
         'select' => 'Pilih',
         'select_all' => 'semua',
         'select_none' => 'tiada',
diff --git a/modules/backend/lang/it/lang.php b/modules/backend/lang/it/lang.php
index caa35a56f..0c391a67d 100644
--- a/modules/backend/lang/it/lang.php
+++ b/modules/backend/lang/it/lang.php
@@ -145,7 +145,6 @@ return [
         'or' => 'o',
         'confirm_tab_close' => 'Vuoi davvero chiudere il tab? Le modifiche non salvate andranno perse.',
         'behavior_not_ready' => 'Il form non è stato inizializzato, verifica di aver chiamato il metodo initForm() nel controller.',
-        'preview_no_files_message' => 'I file non sono stati caricati',
         'select' => 'Seleziona',
         'select_all' => 'tutti',
         'select_none' => 'nessuno',
diff --git a/modules/backend/lang/ja/lang.php b/modules/backend/lang/ja/lang.php
index bce7b076d..d929498ed 100644
--- a/modules/backend/lang/ja/lang.php
+++ b/modules/backend/lang/ja/lang.php
@@ -176,7 +176,6 @@ return [
         'or' => 'または',
         'confirm_tab_close' => '本当にタブを閉じますか？ 保存されていない変更は消えてしまいます。',
         'behavior_not_ready' => 'フォームビヘイビアーは初期化されていません。コントローラーでinitForm()を呼び出しているか確認してください。',
-        'preview_no_files_message' => 'ファイルはアップロードされません。',
         'select' => '選択',
         'select_all' => 'すべて',
         'select_none' => 'なし',
diff --git a/modules/backend/lang/lv/lang.php b/modules/backend/lang/lv/lang.php
index 091e6e6e8..d501b24b3 100644
--- a/modules/backend/lang/lv/lang.php
+++ b/modules/backend/lang/lv/lang.php
@@ -180,7 +180,6 @@ return [
         'or' => 'vai',
         'confirm_tab_close' => 'Vai tiešām vēlaties aizvērt šo cilni? Nesaglabātās izmaiņas būs zudušas.',
         'behavior_not_ready' => 'Forma nav tikusi inicializēta, pārbaudiet vai izsaucāt initForm() savā kontrolierī.',
-        'preview_no_files_message' => 'Faili nav augšupielādēti',
         'select' => 'Izvēlēties',
         'select_all' => 'visus',
         'select_none' => 'nevienu',
diff --git a/modules/backend/lang/nb-no/lang.php b/modules/backend/lang/nb-no/lang.php
index f0f3cc97a..ca24a21f3 100644
--- a/modules/backend/lang/nb-no/lang.php
+++ b/modules/backend/lang/nb-no/lang.php
@@ -181,7 +181,6 @@ return [
         'or' => 'eller',
         'confirm_tab_close' => 'Vil du virkelig lukke fanen? Endringer som ikke er lagret vil gå tapt.',
         'behavior_not_ready' => 'Skjemaegenskap har ikke blitt initialisert, sjekk at du har kalt initForm() i kontrolleren.',
-        'preview_no_files_message' => 'Filer er ikke opplastet',
         'select' => 'Velg',
         'select_all' => 'alle',
         'select_none' => 'ingen',
diff --git a/modules/backend/lang/nl/lang.php b/modules/backend/lang/nl/lang.php
index 067c48126..887f08a09 100644
--- a/modules/backend/lang/nl/lang.php
+++ b/modules/backend/lang/nl/lang.php
@@ -158,7 +158,6 @@ return [
         'or' => 'of',
         'confirm_tab_close' => 'Weet je zeker dat je dit tabblad wilt sluiten? Niet opgeslagen wijzigingen gaan verloren.',
         'behavior_not_ready' => 'Gedrag (behavior) van het formulier is niet geladen. Controleer of initForm() in de controller is aangeroepen.',
-        'preview_no_files_message' => 'Bestanden zijn niet geüploadet',
         'select' => 'Selecteer',
         'select_all' => 'alles',
         'select_none' => 'niets',
diff --git a/modules/backend/lang/pl/lang.php b/modules/backend/lang/pl/lang.php
index 36a372cfd..4cf5233e9 100644
--- a/modules/backend/lang/pl/lang.php
+++ b/modules/backend/lang/pl/lang.php
@@ -176,7 +176,6 @@ return [
         'or' => 'lub',
         'confirm_tab_close' => 'Czy naprawdę chcesz zamknąć tą kartę? Wszystkie niezapisane zmiany zostaną utracone.',
         'behavior_not_ready' => 'Zachowanie formularza nie zostało zainicjowane, sprawdź czy wywołałeś initForm() w swoim kontrolerze.',
-        'preview_no_files_message' => 'Pliki nie są wysyłane',
         'select' => 'Zaznacz',
         'select_all' => 'wszystkie',
         'select_none' => 'żadne',
diff --git a/modules/backend/lang/pt-br/lang.php b/modules/backend/lang/pt-br/lang.php
index 44e4dafdb..d04952998 100644
--- a/modules/backend/lang/pt-br/lang.php
+++ b/modules/backend/lang/pt-br/lang.php
@@ -180,7 +180,6 @@ return [
         'or' => 'ou',
         'confirm_tab_close' => 'Tem certeza que deseja fechar essa aba? As alterações que não foram salvas serão perdidas',
         'behavior_not_ready' => 'O formulário não foi inicializado. Confira se você chamou initForm() no controller.',
-        'preview_no_files_message' => 'Os arquivos não foram carregados',
         'select' => 'Selecionar',
         'select_all' => 'todos',
         'select_none' => 'nenhum',
diff --git a/modules/backend/lang/ro/lang.php b/modules/backend/lang/ro/lang.php
index dede7394d..52f3a7642 100644
--- a/modules/backend/lang/ro/lang.php
+++ b/modules/backend/lang/ro/lang.php
@@ -147,7 +147,6 @@ return [
         'or' => 'sau',
         'confirm_tab_close' => 'Sunteti sigur(a) ca doriti sa inchideti acest tab? Modificarile nesalvate vor fi pierdute.',
         'behavior_not_ready' => 'Setarile initiale ale formularului nu au fost definite, verificati existenta functiei initForm() in controller.',
-        'preview_no_files_message' => 'Fisierele nu au fost incarcate',
         'select' => 'Selectare',
         'select_all' => 'toate',
         'select_none' => 'niciunul',
diff --git a/modules/backend/lang/ru/lang.php b/modules/backend/lang/ru/lang.php
index ec4921fc8..13caba182 100644
--- a/modules/backend/lang/ru/lang.php
+++ b/modules/backend/lang/ru/lang.php
@@ -181,7 +181,6 @@ return [
         'or' => 'или',
         'confirm_tab_close' => 'Закрыть вкладку? Несохраненные изменения будут потеряны.',
         'behavior_not_ready' => 'Поведение формы не было инициализировано, проверьте вызов initForm() в вашем контроллере.',
-        'preview_no_files_message' => 'Файлы не загружены',
         'select' => 'Выбрать',
         'select_all' => 'все',
         'select_none' => 'ничего',
diff --git a/modules/backend/lang/sv/lang.php b/modules/backend/lang/sv/lang.php
index a58a6e13b..2bce33698 100644
--- a/modules/backend/lang/sv/lang.php
+++ b/modules/backend/lang/sv/lang.php
@@ -180,7 +180,6 @@ return [
         'or' => 'eller',
         'confirm_tab_close' => 'Vill du verkligen stänga fliken? Ej sparade ändringar kommer gå förlorade',
         'behavior_not_ready' => 'Formuläregenskap har ej blivit initierad, kontrollera att du anropat initForm() i din controller',
-        'preview_no_files_message' => 'Filen är inte uppladdad',
         'select' => 'Välj',
         'select_all' => 'alla',
         'select_none' => 'ingen',
diff --git a/modules/backend/lang/tr/lang.php b/modules/backend/lang/tr/lang.php
index 35e226109..c4532333c 100644
--- a/modules/backend/lang/tr/lang.php
+++ b/modules/backend/lang/tr/lang.php
@@ -176,7 +176,6 @@ return [
         'or' => 'veya',
         'confirm_tab_close' => 'Bu sekmeyi kapatmak istediğinize emin misiniz? Kaydedilmemiş değişiklikleri kaybedeceksiniz.',
         'behavior_not_ready' => 'Form oluşturulamadı, controller da initForm() metodunu kontrol edin.',
-        'preview_no_files_message' => 'Dosyalar yüklenmedi',
         'select' => 'Seç',
         'select_all' => 'tümü',
         'select_none' => 'hiçbiri',
diff --git a/modules/backend/lang/zh-cn/lang.php b/modules/backend/lang/zh-cn/lang.php
index 3e2aba9e8..679c79bdf 100644
--- a/modules/backend/lang/zh-cn/lang.php
+++ b/modules/backend/lang/zh-cn/lang.php
@@ -180,7 +180,6 @@ return [
         'or' => '或',
         'confirm_tab_close' => '你真的想要关闭这个标签吗? 未保存的改变会丢失.',
         'behavior_not_ready' => '表单还没初始化, 确保你调用了controller中的 initForm().',
-        'preview_no_files_message' => '文件没有上传',
         'select' => '选择',
         'select_all' => 'all',
         'select_none' => 'none',
diff --git a/modules/cms/formwidgets/MediaFinder.php b/modules/cms/formwidgets/MediaFinder.php
index 9a6e47b71..ee7b990d0 100644
--- a/modules/cms/formwidgets/MediaFinder.php
+++ b/modules/cms/formwidgets/MediaFinder.php
@@ -26,7 +26,7 @@ class MediaFinder extends FormWidgetBase
     /**
      * @var string Prompt to display if no record is selected.
      */
-    public $prompt = 'Click the %s button to find a media item';
+    public $prompt = 'cms::lang.mediafinder.default_prompt';
 
     /**
      * @var string Display mode for the selection. Values: file, image.
@@ -71,7 +71,7 @@ class MediaFinder extends FormWidgetBase
         $this->vars['value'] = $value;
         $this->vars['imageUrl'] = $value ? MediaLibrary::url($value) : '';
         $this->vars['field'] = $this->formField;
-        $this->vars['prompt'] = str_replace('%s', '<i class="icon-folder"></i>', $this->prompt);
+        $this->vars['prompt'] = str_replace('%s', '<i class="icon-folder"></i>', trans($this->prompt));
         $this->vars['mode'] = $this->mode;
     }
 
diff --git a/modules/cms/lang/en/lang.php b/modules/cms/lang/en/lang.php
index f2437f19a..39bfb63b1 100644
--- a/modules/cms/lang/en/lang.php
+++ b/modules/cms/lang/en/lang.php
@@ -233,6 +233,9 @@ return [
         'manage_partials' => 'Manage partials',
         'manage_themes' => 'Manage themes'
     ],
+    'mediafinder' => [
+        'default_prompt' => 'Click the %s button to find a media item'
+    ],
     'media' => [
         'invalid_path' => "Invalid file path specified: ':path'.",
         'menu_label' => 'Media',