diff --git a/src/core/services/filepool.ts b/src/core/services/filepool.ts
index 7f0908419..9455dfbfb 100644
--- a/src/core/services/filepool.ts
+++ b/src/core/services/filepool.ts
@@ -97,6 +97,7 @@ export class CoreFilepoolProvider {
         new RegExp('(\\?|&)forcedownload=[0-1]'),
         new RegExp('(\\?|&)preview=[A-Za-z0-9]+'),
         new RegExp('(\\?|&)offline=[0-1]', 'g'),
+        new RegExp(/(\\?|&)lang=[A-Za-z\-_]+/, 'g'),
     ];
 
     // To handle file downloads using the queue.
diff --git a/src/core/services/lang.ts b/src/core/services/lang.ts
index 690724c5c..ec7777d3f 100644
--- a/src/core/services/lang.ts
+++ b/src/core/services/lang.ts
@@ -249,6 +249,19 @@ export class CoreLangProvider {
         return format ? this.formatLanguage(this.currentLanguage, format) : this.currentLanguage;
     }
 
+    /**
+     * Get current language sync.
+     *
+     * @returns Current language or undefined.
+     */
+    getCurrentLanguageSync(format?: CoreLangFormat): string | undefined {
+        if (this.currentLanguage === undefined) {
+            return;
+        }
+
+        return format ? this.formatLanguage(this.currentLanguage, format) : this.currentLanguage;
+    }
+
     /**
      * Update a language code to the given format.
      *
diff --git a/src/core/services/utils/dom.ts b/src/core/services/utils/dom.ts
index 3ea323352..f41dd5961 100644
--- a/src/core/services/utils/dom.ts
+++ b/src/core/services/utils/dom.ts
@@ -934,14 +934,15 @@ export class CoreDomUtilsProvider {
      * @param options More options. See https://ionicframework.com/docs/v3/api/components/alert/AlertController/
      * @returns Promise resolved if the user confirms and rejected with a canceled error if he cancels.
      */
-    showDeleteConfirm(
+    async showDeleteConfirm(
         translateMessage: string = 'core.areyousure',
         translateArgs: Record<string, unknown> = {},
         options: AlertOptions = {},
     ): Promise<void> {
-        return new Promise((resolve, reject): void => {
-            options.message = Translate.instant(translateMessage, translateArgs);
+        options.message = Translate.instant(translateMessage, translateArgs);
+        options.message = await CoreLang.filterMultilang(options.message);
 
+        return new Promise((resolve, reject): void => {
             options.buttons = [
                 {
                     text: Translate.instant('core.cancel'),
diff --git a/src/core/services/utils/url.ts b/src/core/services/utils/url.ts
index a89f37267..e05a8725b 100644
--- a/src/core/services/utils/url.ts
+++ b/src/core/services/utils/url.ts
@@ -211,7 +211,8 @@ export class CoreUrlUtilsProvider {
             url = this.addParamsToUrl(url, { token });
         }
 
-        return this.addParamsToUrl(url, { offline: '1' }); // Always send offline=1 (it's for external repositories).
+        // Always send offline=1 (it's for external repositories).
+        return this.addParamsToUrl(url, { offline: '1', lang: CoreLang.getCurrentLanguageSync(CoreLangFormat.LMS) });
     }
 
     /**