diff --git a/lib/input.js b/lib/input.js
index d3dc291..0511e43 100644
--- a/lib/input.js
+++ b/lib/input.js
@@ -604,6 +604,12 @@ class Input extends Logger {
   * @param {*} locale
   */
   language(locale = false) {
+    // Same product switch as ua_language(): when the deployment forces the
+    // default language, nothing request-derived (params, headers, browser
+    // locale) may override it.
+    if (global.myDrumee?.forceDefaultLanguage) {
+      return this.defaultLanguage();
+    }
     if (this.get("Xlang") != null) {
       return this.get("Xlang");
     }
@@ -760,6 +766,12 @@ class Input extends Logger {
    *
    */
   page_language() {
+    // Same product switch as ua_language(): a deployment that forces the
+    // default language serves every page in it — the pagelang header and
+    // the browser's accept-language must not leak through.
+    if (global.myDrumee?.forceDefaultLanguage) {
+      return this.defaultLanguage();
+    }
     let l = this.get("pagelang") || this.get("page-language");
     if (l != null) {
       return l;