diff --git a/CHANGES.md b/CHANGES.md
index d52e9b38adb..e415d8547db 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -51,6 +51,7 @@ Other Changes:
 * [#13316](http://dev.ckeditor.com/ticket/13316): Made [`CKEDITOR.env.isCompatible`](http://docs.ckeditor.com/#!/api/CKEDITOR.env-property-isCompatible) a blacklist rather than a whitelist. More about the change in the [Browser Compatibility](http://docs.ckeditor.com/#!/guide/dev_browsers) guide.
 * [#13398](http://dev.ckeditor.com/ticket/13398): Renamed `CKEDITOR.fileTools.UploadsRepository` to [`CKEDITOR.fileTools.UploadRepository`](http://docs.ckeditor.com/#!/api/CKEDITOR.fileTools.uploadRepository) and changed all related properties.
 * [#13279](http://dev.ckeditor.com/ticket/13279): Reviewed CSS vendor prefixes.
+* [#13454](http://dev.ckeditor.com/ticket/13454): Removed unused `lang.image.alertUrl` token.
 
 ## CKEditor 4.5 Beta
 
diff --git a/dev/langtool/meta/ckeditor.plugin-image/meta.txt b/dev/langtool/meta/ckeditor.plugin-image/meta.txt
index 0b6fa386f5c..cdbcdc7ae3b 100644
--- a/dev/langtool/meta/ckeditor.plugin-image/meta.txt
+++ b/dev/langtool/meta/ckeditor.plugin-image/meta.txt
@@ -1,7 +1,6 @@
 # Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 # For licensing, see LICENSE.md or http://ckeditor.com/license
 
-alertUrl = 
 alt = Label for the Alternative Text field of the Image Properties dialog window.
 border = Label for the Border field of the Image Properties dialog window.
 btnUpload = Label for the button that uploads the file to the server.
diff --git a/plugins/image/lang/af.js b/plugins/image/lang/af.js
index 2c1cdc62608..a31a3bba021 100644
--- a/plugins/image/lang/af.js
+++ b/plugins/image/lang/af.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'af', {
-	alertUrl: 'Gee URL van afbeelding.',
 	alt: 'Alternatiewe teks',
 	border: 'Rand',
 	btnUpload: 'Stuur na bediener',
diff --git a/plugins/image/lang/ar.js b/plugins/image/lang/ar.js
index 22e01377c1a..3497b4a10b3 100644
--- a/plugins/image/lang/ar.js
+++ b/plugins/image/lang/ar.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'ar', {
-	alertUrl: 'فضلاً أكتب الموقع الذي توجد عليه هذه الصورة.',
 	alt: 'عنوان الصورة',
 	border: 'سمك الحدود',
 	btnUpload: 'أرسلها للخادم',
diff --git a/plugins/image/lang/bg.js b/plugins/image/lang/bg.js
index d3e58ede6a2..ce985b0672c 100644
--- a/plugins/image/lang/bg.js
+++ b/plugins/image/lang/bg.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'bg', {
-	alertUrl: 'Моля, въведете пълния път до изображението',
 	alt: 'Алтернативен текст',
 	border: 'Рамка',
 	btnUpload: 'Изпрати я на сървъра',
diff --git a/plugins/image/lang/bn.js b/plugins/image/lang/bn.js
index 2eee3c4f75a..665933d66da 100644
--- a/plugins/image/lang/bn.js
+++ b/plugins/image/lang/bn.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'bn', {
-	alertUrl: 'অনুগ্রহক করে ছবির URL টাইপ করুন',
 	alt: 'বিকল্প টেক্সট',
 	border: 'বর্ডার',
 	btnUpload: 'ইহাকে সার্ভারে প্রেরন কর',
diff --git a/plugins/image/lang/bs.js b/plugins/image/lang/bs.js
index 57747eb9ebf..7b89c23ac20 100644
--- a/plugins/image/lang/bs.js
+++ b/plugins/image/lang/bs.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'bs', {
-	alertUrl: 'Molimo ukucajte URL od slike.',
 	alt: 'Tekst na slici',
 	border: 'Okvir',
 	btnUpload: 'Šalji na server',
diff --git a/plugins/image/lang/ca.js b/plugins/image/lang/ca.js
index 1a1c658a3ae..6e8f0d343f0 100644
--- a/plugins/image/lang/ca.js
+++ b/plugins/image/lang/ca.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'ca', {
-	alertUrl: 'Si us plau, escriviu la URL de la imatge',
 	alt: 'Text alternatiu',
 	border: 'Vora',
 	btnUpload: 'Envia-la al servidor',
diff --git a/plugins/image/lang/cs.js b/plugins/image/lang/cs.js
index 635a47de2c8..96ad9a9dc2d 100644
--- a/plugins/image/lang/cs.js
+++ b/plugins/image/lang/cs.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'cs', {
-	alertUrl: 'Zadejte prosím URL obrázku',
 	alt: 'Alternativní text',
 	border: 'Okraje',
 	btnUpload: 'Odeslat na server',
diff --git a/plugins/image/lang/cy.js b/plugins/image/lang/cy.js
index dd239fc3f14..0b37b758214 100644
--- a/plugins/image/lang/cy.js
+++ b/plugins/image/lang/cy.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'cy', {
-	alertUrl: 'Rhowch URL y ddelwedd',
 	alt: 'Testun Amgen',
 	border: 'Ymyl',
 	btnUpload: 'Anfon i\'r Gweinydd',
diff --git a/plugins/image/lang/da.js b/plugins/image/lang/da.js
index 4f88111f04e..3381b154fde 100644
--- a/plugins/image/lang/da.js
+++ b/plugins/image/lang/da.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'da', {
-	alertUrl: 'Indtast stien til billedet',
 	alt: 'Alternativ tekst',
 	border: 'Ramme',
 	btnUpload: 'Upload fil til serveren',
diff --git a/plugins/image/lang/de.js b/plugins/image/lang/de.js
index a75744eaf6a..0fdf6fc40ce 100644
--- a/plugins/image/lang/de.js
+++ b/plugins/image/lang/de.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'de', {
-	alertUrl: 'Bitte geben Sie die Bild-URL an',
 	alt: 'Alternativer Text',
 	border: 'Rahmen',
 	btnUpload: 'Zum Server senden',
diff --git a/plugins/image/lang/el.js b/plugins/image/lang/el.js
index b0d39875507..ffa1cd43882 100644
--- a/plugins/image/lang/el.js
+++ b/plugins/image/lang/el.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'el', {
-	alertUrl: 'Εισάγετε την τοποθεσία (URL) της εικόνας',
 	alt: 'Εναλλακτικό Κείμενο',
 	border: 'Περίγραμμα',
 	btnUpload: 'Αποστολή στον Διακομιστή',
diff --git a/plugins/image/lang/en-au.js b/plugins/image/lang/en-au.js
index a98399145e0..ed045823ca0 100644
--- a/plugins/image/lang/en-au.js
+++ b/plugins/image/lang/en-au.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'en-au', {
-	alertUrl: 'Please type the image URL',
 	alt: 'Alternative Text',
 	border: 'Border',
 	btnUpload: 'Send it to the Server',
diff --git a/plugins/image/lang/en-ca.js b/plugins/image/lang/en-ca.js
index 9c850c7ae10..23eb48b7ba7 100644
--- a/plugins/image/lang/en-ca.js
+++ b/plugins/image/lang/en-ca.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'en-ca', {
-	alertUrl: 'Please type the image URL',
 	alt: 'Alternative Text',
 	border: 'Border',
 	btnUpload: 'Send it to the Server',
diff --git a/plugins/image/lang/en-gb.js b/plugins/image/lang/en-gb.js
index 866c1fcb21c..3b6e73440ea 100644
--- a/plugins/image/lang/en-gb.js
+++ b/plugins/image/lang/en-gb.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'en-gb', {
-	alertUrl: 'Please type the image URL',
 	alt: 'Alternative Text',
 	border: 'Border',
 	btnUpload: 'Send it to the Server',
diff --git a/plugins/image/lang/en.js b/plugins/image/lang/en.js
index dbfbb8d47d2..3b2c9d5b62b 100644
--- a/plugins/image/lang/en.js
+++ b/plugins/image/lang/en.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'en', {
-	alertUrl: 'Please type the image URL',
 	alt: 'Alternative Text',
 	border: 'Border',
 	btnUpload: 'Send it to the Server',
diff --git a/plugins/image/lang/eo.js b/plugins/image/lang/eo.js
index 55aac87996c..abe930f3acc 100644
--- a/plugins/image/lang/eo.js
+++ b/plugins/image/lang/eo.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'eo', {
-	alertUrl: 'Bonvolu tajpi la retadreson de la bildo',
 	alt: 'Anstataŭiga Teksto',
 	border: 'Bordero',
 	btnUpload: 'Sendu al Servilo',
diff --git a/plugins/image/lang/es.js b/plugins/image/lang/es.js
index 8369fb6d71f..4a2fc006c8c 100644
--- a/plugins/image/lang/es.js
+++ b/plugins/image/lang/es.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'es', {
-	alertUrl: 'Por favor escriba la URL de la imagen',
 	alt: 'Texto Alternativo',
 	border: 'Borde',
 	btnUpload: 'Enviar al Servidor',
diff --git a/plugins/image/lang/et.js b/plugins/image/lang/et.js
index 5b836aa2ea8..6dd0e95c72d 100644
--- a/plugins/image/lang/et.js
+++ b/plugins/image/lang/et.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'et', {
-	alertUrl: 'Palun kirjuta pildi URL',
 	alt: 'Alternatiivne tekst',
 	border: 'Joon',
 	btnUpload: 'Saada serverisse',
diff --git a/plugins/image/lang/eu.js b/plugins/image/lang/eu.js
index 591b9a944d2..64dd928d8d5 100644
--- a/plugins/image/lang/eu.js
+++ b/plugins/image/lang/eu.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'eu', {
-	alertUrl: 'Mesedez Irudiaren URLa idatzi',
 	alt: 'Ordezko Testua',
 	border: 'Ertza',
 	btnUpload: 'Zerbitzarira bidalia',
diff --git a/plugins/image/lang/fa.js b/plugins/image/lang/fa.js
index f20412662ac..93f635b489d 100644
--- a/plugins/image/lang/fa.js
+++ b/plugins/image/lang/fa.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'fa', {
-	alertUrl: 'لطفا URL تصویر را بنویسید',
 	alt: 'متن جایگزین',
 	border: 'لبه',
 	btnUpload: 'به سرور بفرست',
diff --git a/plugins/image/lang/fi.js b/plugins/image/lang/fi.js
index 90104658277..3f1b7a33c72 100644
--- a/plugins/image/lang/fi.js
+++ b/plugins/image/lang/fi.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'fi', {
-	alertUrl: 'Kirjoita kuvan osoite (URL)',
 	alt: 'Vaihtoehtoinen teksti',
 	border: 'Kehys',
 	btnUpload: 'Lähetä palvelimelle',
diff --git a/plugins/image/lang/fo.js b/plugins/image/lang/fo.js
index b42525eb841..28d35f02263 100644
--- a/plugins/image/lang/fo.js
+++ b/plugins/image/lang/fo.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'fo', {
-	alertUrl: 'Rita slóðina til myndina',
 	alt: 'Alternativur tekstur',
 	border: 'Bordi',
 	btnUpload: 'Send til ambætaran',
diff --git a/plugins/image/lang/fr-ca.js b/plugins/image/lang/fr-ca.js
index ba40fe9bb0b..e15608aec83 100644
--- a/plugins/image/lang/fr-ca.js
+++ b/plugins/image/lang/fr-ca.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'fr-ca', {
-	alertUrl: 'Veuillez saisir l\'URL de l\'image',
 	alt: 'Texte alternatif',
 	border: 'Bordure',
 	btnUpload: 'Envoyer sur le serveur',
diff --git a/plugins/image/lang/fr.js b/plugins/image/lang/fr.js
index 525857f4c61..50d81777b4e 100644
--- a/plugins/image/lang/fr.js
+++ b/plugins/image/lang/fr.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'fr', {
-	alertUrl: 'Veuillez entrer l\'adresse de l\'image',
 	alt: 'Texte de remplacement',
 	border: 'Bordure',
 	btnUpload: 'Envoyer sur le serveur',
diff --git a/plugins/image/lang/gl.js b/plugins/image/lang/gl.js
index 1fa3b6963d0..b7c0f190827 100644
--- a/plugins/image/lang/gl.js
+++ b/plugins/image/lang/gl.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'gl', {
-	alertUrl: 'Escriba o URL da imaxe',
 	alt: 'Texto alternativo',
 	border: 'Bordo',
 	btnUpload: 'Enviar ao servidor',
diff --git a/plugins/image/lang/gu.js b/plugins/image/lang/gu.js
index fb40ced82df..53dcb6b6c66 100644
--- a/plugins/image/lang/gu.js
+++ b/plugins/image/lang/gu.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'gu', {
-	alertUrl: 'ચિત્રની URL ટાઇપ કરો',
 	alt: 'ઑલ્ટર્નટ ટેક્સ્ટ',
 	border: 'બોર્ડર',
 	btnUpload: 'આ સર્વરને મોકલવું',
diff --git a/plugins/image/lang/he.js b/plugins/image/lang/he.js
index 81eea40d842..f63335cab54 100644
--- a/plugins/image/lang/he.js
+++ b/plugins/image/lang/he.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'he', {
-	alertUrl: 'יש להקליד את כתובת התמונה',
 	alt: 'טקסט חלופי',
 	border: 'מסגרת',
 	btnUpload: 'שליחה לשרת',
diff --git a/plugins/image/lang/hi.js b/plugins/image/lang/hi.js
index a631ee300f5..f2d2b8bef85 100644
--- a/plugins/image/lang/hi.js
+++ b/plugins/image/lang/hi.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'hi', {
-	alertUrl: 'तस्वीर का URL टाइप करें ',
 	alt: 'वैकल्पिक टेक्स्ट',
 	border: 'बॉर्डर',
 	btnUpload: 'इसे सर्वर को भेजें',
diff --git a/plugins/image/lang/hr.js b/plugins/image/lang/hr.js
index ce89090682f..f22015464d1 100644
--- a/plugins/image/lang/hr.js
+++ b/plugins/image/lang/hr.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'hr', {
-	alertUrl: 'Unesite URL slike',
 	alt: 'Alternativni tekst',
 	border: 'Okvir',
 	btnUpload: 'Pošalji na server',
diff --git a/plugins/image/lang/hu.js b/plugins/image/lang/hu.js
index d43849383ae..e6fdaaddce5 100644
--- a/plugins/image/lang/hu.js
+++ b/plugins/image/lang/hu.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'hu', {
-	alertUrl: 'Töltse ki a kép webcímét',
 	alt: 'Buborék szöveg',
 	border: 'Keret',
 	btnUpload: 'Küldés a szerverre',
diff --git a/plugins/image/lang/id.js b/plugins/image/lang/id.js
index f8190726afc..c942318185b 100644
--- a/plugins/image/lang/id.js
+++ b/plugins/image/lang/id.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'id', {
-	alertUrl: 'Mohon tulis URL gambar',
 	alt: 'Teks alternatif',
 	border: 'Batas',
 	btnUpload: 'Kirim ke Server',
diff --git a/plugins/image/lang/is.js b/plugins/image/lang/is.js
index ae60947e3fa..1f2b744bda1 100644
--- a/plugins/image/lang/is.js
+++ b/plugins/image/lang/is.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'is', {
-	alertUrl: 'Sláðu inn slóðina að myndinni',
 	alt: 'Baklægur texti',
 	border: 'Rammi',
 	btnUpload: 'Hlaða upp',
diff --git a/plugins/image/lang/it.js b/plugins/image/lang/it.js
index 54116410b05..35c46fd82d5 100644
--- a/plugins/image/lang/it.js
+++ b/plugins/image/lang/it.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'it', {
-	alertUrl: 'Devi inserire l\'URL per l\'immagine',
 	alt: 'Testo alternativo',
 	border: 'Bordo',
 	btnUpload: 'Invia al server',
diff --git a/plugins/image/lang/ja.js b/plugins/image/lang/ja.js
index 253484423e4..3432c261f0a 100644
--- a/plugins/image/lang/ja.js
+++ b/plugins/image/lang/ja.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'ja', {
-	alertUrl: '画像のURLを入力してください',
 	alt: '代替テキスト',
 	border: '枠線の幅',
 	btnUpload: 'サーバーに送信',
diff --git a/plugins/image/lang/ka.js b/plugins/image/lang/ka.js
index 623cdc6be01..c0520a12a89 100644
--- a/plugins/image/lang/ka.js
+++ b/plugins/image/lang/ka.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'ka', {
-	alertUrl: 'აკრიფეთ სურათის URL',
 	alt: 'სანაცვლო ტექსტი',
 	border: 'ჩარჩო',
 	btnUpload: 'სერვერისთვის გაგზავნა',
diff --git a/plugins/image/lang/km.js b/plugins/image/lang/km.js
index 75f1087b071..58e2b2e089d 100644
--- a/plugins/image/lang/km.js
+++ b/plugins/image/lang/km.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'km', {
-	alertUrl: 'សូម​បញ្ចូល URL រូបភាព',
 	alt: 'អត្ថបទជំនួស',
 	border: 'ស៊ុម',
 	btnUpload: 'ផ្ញើ​ទៅ​ម៉ាស៊ីន​បម្រើ',
diff --git a/plugins/image/lang/ko.js b/plugins/image/lang/ko.js
index 5553a9160ad..b672693107a 100644
--- a/plugins/image/lang/ko.js
+++ b/plugins/image/lang/ko.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'ko', {
-	alertUrl: '이미지 URL을 입력하십시요',
 	alt: '이미지 설명',
 	border: '테두리',
 	btnUpload: '서버로 전송',
diff --git a/plugins/image/lang/ku.js b/plugins/image/lang/ku.js
index adafe10ac34..c20ef0ee43e 100644
--- a/plugins/image/lang/ku.js
+++ b/plugins/image/lang/ku.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'ku', {
-	alertUrl: 'تکایه ناونیشانی بەستەری وێنه بنووسه',
 	alt: 'جێگرەوەی دەق',
 	border: 'پەراوێز',
 	btnUpload: 'ناردنی بۆ ڕاژه',
diff --git a/plugins/image/lang/lt.js b/plugins/image/lang/lt.js
index 0a8c1f4927e..5c612b01cba 100644
--- a/plugins/image/lang/lt.js
+++ b/plugins/image/lang/lt.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'lt', {
-	alertUrl: 'Prašome įvesti vaizdo URL',
 	alt: 'Alternatyvus Tekstas',
 	border: 'Rėmelis',
 	btnUpload: 'Siųsti į serverį',
diff --git a/plugins/image/lang/lv.js b/plugins/image/lang/lv.js
index 7d37257553c..e875e8fbf29 100644
--- a/plugins/image/lang/lv.js
+++ b/plugins/image/lang/lv.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'lv', {
-	alertUrl: 'Lūdzu norādīt attēla hipersaiti',
 	alt: 'Alternatīvais teksts',
 	border: 'Rāmis',
 	btnUpload: 'Nosūtīt serverim',
diff --git a/plugins/image/lang/mk.js b/plugins/image/lang/mk.js
index d2bbcc3a30c..bc77ebb19cc 100644
--- a/plugins/image/lang/mk.js
+++ b/plugins/image/lang/mk.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'mk', {
-	alertUrl: 'Please type the image URL', // MISSING
 	alt: 'Alternative Text', // MISSING
 	border: 'Border', // MISSING
 	btnUpload: 'Send it to the Server', // MISSING
diff --git a/plugins/image/lang/mn.js b/plugins/image/lang/mn.js
index 2d9334fa6fc..ebd5f97a1cc 100644
--- a/plugins/image/lang/mn.js
+++ b/plugins/image/lang/mn.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'mn', {
-	alertUrl: 'Зурагны URL-ын төрлийн сонгоно уу',
 	alt: 'Зургийг орлох бичвэр',
 	border: 'Хүрээ',
 	btnUpload: 'Үүнийг сервэррүү илгээ',
diff --git a/plugins/image/lang/ms.js b/plugins/image/lang/ms.js
index dd79b1cfe43..b396e0201a2 100644
--- a/plugins/image/lang/ms.js
+++ b/plugins/image/lang/ms.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'ms', {
-	alertUrl: 'Sila taip URL untuk fail gambar',
 	alt: 'Text Alternatif',
 	border: 'Border',
 	btnUpload: 'Hantar ke Server',
diff --git a/plugins/image/lang/nb.js b/plugins/image/lang/nb.js
index 2acc7914769..a634811620e 100644
--- a/plugins/image/lang/nb.js
+++ b/plugins/image/lang/nb.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'nb', {
-	alertUrl: 'Vennligst skriv bilde-urlen',
 	alt: 'Alternativ tekst',
 	border: 'Ramme',
 	btnUpload: 'Send det til serveren',
diff --git a/plugins/image/lang/nl.js b/plugins/image/lang/nl.js
index b8e552ab6e0..6edb83e6985 100644
--- a/plugins/image/lang/nl.js
+++ b/plugins/image/lang/nl.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'nl', {
-	alertUrl: 'Geef de URL van de afbeelding',
 	alt: 'Alternatieve tekst',
 	border: 'Rand',
 	btnUpload: 'Naar server verzenden',
diff --git a/plugins/image/lang/no.js b/plugins/image/lang/no.js
index 322f29cb59d..8a50934daf1 100644
--- a/plugins/image/lang/no.js
+++ b/plugins/image/lang/no.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'no', {
-	alertUrl: 'Vennligst skriv bilde-urlen',
 	alt: 'Alternativ tekst',
 	border: 'Ramme',
 	btnUpload: 'Send det til serveren',
diff --git a/plugins/image/lang/pl.js b/plugins/image/lang/pl.js
index 833cf589710..950c8a30139 100644
--- a/plugins/image/lang/pl.js
+++ b/plugins/image/lang/pl.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'pl', {
-	alertUrl: 'Podaj adres obrazka.',
 	alt: 'Tekst zastępczy',
 	border: 'Obramowanie',
 	btnUpload: 'Wyślij',
diff --git a/plugins/image/lang/pt-br.js b/plugins/image/lang/pt-br.js
index cce00bb04bf..c02acf42bba 100644
--- a/plugins/image/lang/pt-br.js
+++ b/plugins/image/lang/pt-br.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'pt-br', {
-	alertUrl: 'Por favor, digite a URL da imagem.',
 	alt: 'Texto Alternativo',
 	border: 'Borda',
 	btnUpload: 'Enviar para o Servidor',
diff --git a/plugins/image/lang/pt.js b/plugins/image/lang/pt.js
index 9431cbc3cfd..689e587f687 100644
--- a/plugins/image/lang/pt.js
+++ b/plugins/image/lang/pt.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'pt', {
-	alertUrl: 'Por favor introduza o URL da imagem',
 	alt: 'Texto Alternativo',
 	border: 'Limite',
 	btnUpload: 'Enviar para o servidor',
diff --git a/plugins/image/lang/ro.js b/plugins/image/lang/ro.js
index d1deece73ce..e773ef3bd6a 100644
--- a/plugins/image/lang/ro.js
+++ b/plugins/image/lang/ro.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'ro', {
-	alertUrl: 'Vă rugăm să scrieţi URL-ul imaginii',
 	alt: 'Text alternativ',
 	border: 'Margine',
 	btnUpload: 'Trimite la server',
diff --git a/plugins/image/lang/ru.js b/plugins/image/lang/ru.js
index d9327ffabf9..9c18c1e22cd 100644
--- a/plugins/image/lang/ru.js
+++ b/plugins/image/lang/ru.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'ru', {
-	alertUrl: 'Пожалуйста, введите ссылку на изображение',
 	alt: 'Альтернативный текст',
 	border: 'Граница',
 	btnUpload: 'Загрузить на сервер',
diff --git a/plugins/image/lang/si.js b/plugins/image/lang/si.js
index dd051f360a3..8f2b65107ad 100644
--- a/plugins/image/lang/si.js
+++ b/plugins/image/lang/si.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'si', {
-	alertUrl: 'කරුණාකර රුපයේ URL ලියන්න',
 	alt: 'විකල්ප ',
 	border: 'සීමාවවල ',
 	btnUpload: 'සේවාදායකය වෙත යොමුකිරිම',
diff --git a/plugins/image/lang/sk.js b/plugins/image/lang/sk.js
index 4b87b21e43c..9c24f0e794a 100644
--- a/plugins/image/lang/sk.js
+++ b/plugins/image/lang/sk.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'sk', {
-	alertUrl: 'Zadajte prosím URL obrázka',
 	alt: 'Alternatívny text',
 	border: 'Rám (border)',
 	btnUpload: 'Odoslať to na server',
diff --git a/plugins/image/lang/sl.js b/plugins/image/lang/sl.js
index 0a1a506ad2b..e7dd4e3f2f5 100644
--- a/plugins/image/lang/sl.js
+++ b/plugins/image/lang/sl.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'sl', {
-	alertUrl: 'Vnesite URL slike',
 	alt: 'Nadomestno besedilo',
 	border: 'Obroba',
 	btnUpload: 'Pošlji na strežnik',
diff --git a/plugins/image/lang/sq.js b/plugins/image/lang/sq.js
index 309766166d1..2de6f8ca4dc 100644
--- a/plugins/image/lang/sq.js
+++ b/plugins/image/lang/sq.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'sq', {
-	alertUrl: 'Ju lutemi shkruani URL-në e fotos',
 	alt: 'Tekst Alternativ',
 	border: 'Korniza',
 	btnUpload: 'Dërgo në server',
diff --git a/plugins/image/lang/sr-latn.js b/plugins/image/lang/sr-latn.js
index 7e5b932a34f..5e097ed2c82 100644
--- a/plugins/image/lang/sr-latn.js
+++ b/plugins/image/lang/sr-latn.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'sr-latn', {
-	alertUrl: 'Unesite URL slike',
 	alt: 'Alternativni tekst',
 	border: 'Okvir',
 	btnUpload: 'Pošalji na server',
diff --git a/plugins/image/lang/sr.js b/plugins/image/lang/sr.js
index fc4dcb44267..e4cbcbf1cb6 100644
--- a/plugins/image/lang/sr.js
+++ b/plugins/image/lang/sr.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'sr', {
-	alertUrl: 'Унесите УРЛ слике',
 	alt: 'Алтернативни текст',
 	border: 'Оквир',
 	btnUpload: 'Пошаљи на сервер',
diff --git a/plugins/image/lang/sv.js b/plugins/image/lang/sv.js
index c3e159afb49..2981f4eb7ff 100644
--- a/plugins/image/lang/sv.js
+++ b/plugins/image/lang/sv.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'sv', {
-	alertUrl: 'Var god och ange bildens URL',
 	alt: 'Alternativ text',
 	border: 'Kant',
 	btnUpload: 'Skicka till server',
diff --git a/plugins/image/lang/th.js b/plugins/image/lang/th.js
index cb2544e23ca..841353f58c9 100644
--- a/plugins/image/lang/th.js
+++ b/plugins/image/lang/th.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'th', {
-	alertUrl: 'กรุณาระบุที่อยู่อ้างอิงออนไลน์ของไฟล์รูปภาพ (URL)',
 	alt: 'คำประกอบรูปภาพ',
 	border: 'ขนาดขอบรูป',
 	btnUpload: 'อัพโหลดไฟล์ไปเก็บไว้ที่เครื่องแม่ข่าย (เซิร์ฟเวอร์)',
diff --git a/plugins/image/lang/tr.js b/plugins/image/lang/tr.js
index 571c6a5d8f2..a2190296bb7 100644
--- a/plugins/image/lang/tr.js
+++ b/plugins/image/lang/tr.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'tr', {
-	alertUrl: 'Lütfen resmin URL\'sini yazınız',
 	alt: 'Alternatif Yazı',
 	border: 'Kenar',
 	btnUpload: 'Sunucuya Yolla',
diff --git a/plugins/image/lang/tt.js b/plugins/image/lang/tt.js
index 33170662fe5..76d83f7aa7c 100644
--- a/plugins/image/lang/tt.js
+++ b/plugins/image/lang/tt.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'tt', {
-	alertUrl: 'Рәсемгә сылталама языгыз',
 	alt: 'Альтернатив текст',
 	border: 'Чик',
 	btnUpload: 'Серверга җибәрү',
diff --git a/plugins/image/lang/ug.js b/plugins/image/lang/ug.js
index e11b397221b..132ae474c1b 100644
--- a/plugins/image/lang/ug.js
+++ b/plugins/image/lang/ug.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'ug', {
-	alertUrl: 'سۈرەت ئادرېسىنى كىرگۈزۈڭ',
 	alt: 'تېكىست ئالماشتۇر',
 	border: 'گىرۋەك چوڭلۇقى',
 	btnUpload: 'مۇلازىمېتىرغا يۈكلە',
diff --git a/plugins/image/lang/uk.js b/plugins/image/lang/uk.js
index 41aec32cb22..df97e3c8eb5 100644
--- a/plugins/image/lang/uk.js
+++ b/plugins/image/lang/uk.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'uk', {
-	alertUrl: 'Будь ласка, вкажіть URL зображення',
 	alt: 'Альтернативний текст',
 	border: 'Рамка',
 	btnUpload: 'Надіслати на сервер',
diff --git a/plugins/image/lang/vi.js b/plugins/image/lang/vi.js
index 0d8ed6f819b..627cabdeae8 100644
--- a/plugins/image/lang/vi.js
+++ b/plugins/image/lang/vi.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'vi', {
-	alertUrl: 'Hãy đưa vào đường dẫn của ảnh',
 	alt: 'Chú thích ảnh',
 	border: 'Đường viền',
 	btnUpload: 'Tải lên máy chủ',
diff --git a/plugins/image/lang/zh-cn.js b/plugins/image/lang/zh-cn.js
index 3d52e8bc10c..a05d71d6e57 100644
--- a/plugins/image/lang/zh-cn.js
+++ b/plugins/image/lang/zh-cn.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'zh-cn', {
-	alertUrl: '请输入图像地址',
 	alt: '替换文本',
 	border: '边框大小',
 	btnUpload: '上传到服务器',
diff --git a/plugins/image/lang/zh.js b/plugins/image/lang/zh.js
index 92a41418d0e..d74c556cdce 100644
--- a/plugins/image/lang/zh.js
+++ b/plugins/image/lang/zh.js
@@ -3,7 +3,6 @@ Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.md or http://ckeditor.com/license
 */
 CKEDITOR.plugins.setLang( 'image', 'zh', {
-	alertUrl: '請輸入圖片 URL',
 	alt: '替代文字',
 	border: '框線',
 	btnUpload: '傳送到伺服器',