diff --git a/web/Makefile b/web/Makefile
index 7ac51ba276..07b3cb7f84 100644
--- a/web/Makefile
+++ b/web/Makefile
@@ -177,15 +177,15 @@ bots:
 # when you start a new project, use the latest release, and update it from time to time
 test/common:
 	flock Makefile sh -ec '\
-	    git fetch --depth=1 https://github.com/cockpit-project/cockpit.git 307; \
+	    git fetch --depth=1 https://github.com/cockpit-project/cockpit.git 309; \
 	    git checkout --force FETCH_HEAD -- test/common; \
 	    git reset test/common'
 
 # checkout Cockpit's PF/React/build library; again this has no API stability guarantee, so check out a stable tag
-# TODO: replace the commit with the tag 307 once it is released, which includes cockpit.js as a ES6 module in lib/.
+# TODO: replace the commit with the tag 309 once it is released, which includes cockpit.js as a ES6 module in lib/.
 $(LIB_TEST):
 	flock Makefile sh -ec '\
-	    git fetch --depth=1 https://github.com/cockpit-project/cockpit.git 307; \
+	    git fetch --depth=1 https://github.com/cockpit-project/cockpit.git 309; \
 	    git checkout --force FETCH_HEAD -- ../pkg/lib; \
 	    git reset -- ../pkg/lib'
 	mv ../pkg/lib src/ && rmdir ../pkg
diff --git a/web/package/cockpit-agama.changes b/web/package/cockpit-agama.changes
index 11aa800032..6769afa843 100644
--- a/web/package/cockpit-agama.changes
+++ b/web/package/cockpit-agama.changes
@@ -1,7 +1,12 @@
+-------------------------------------------------------------------
+Mon Feb 12 11:53:29 UTC 2024 - Imobach Gonzalez Sosa <igonzalezsosa@suse.com>
+
+- Update cockpit.js to version 309 (gh#openSUSE/agama#1038).
+
 -------------------------------------------------------------------
 Mon Jan 29 14:34:37 UTC 2024 - Knut Anderssen <kanderssen@suse.com>
 
-- Partly replacing the NetworkManager client by the agama one 
+- Partly replacing the NetworkManager client by the Agama one
   (gh#openSUSE/agama#1006).
 
 -------------------------------------------------------------------
@@ -9,7 +14,7 @@ Fri Jan 19 09:34:26 UTC 2024 -  Nagu <nagukalakuntla@gmail.com>
 
 - Storage UI: show mount point selector only when the user can change it.
   (gh#openSUSE/agama#1007)
-  
+
 -------------------------------------------------------------------
 Thu Jan 18 08:33:52 UTC 2024 - Ancor Gonzalez Sosa <ancor@suse.com>
 
diff --git a/web/src/lib/cockpit.js b/web/src/lib/cockpit.js
index 34873a73b0..bef8e61033 100644
--- a/web/src/lib/cockpit.js
+++ b/web/src/lib/cockpit.js
@@ -3709,6 +3709,7 @@ function factory() {
 
     cockpit.language = "en";
     cockpit.language_direction = "ltr";
+    const test_l10n = window.localStorage.test_l10n;
 
     cockpit.locale = function locale(po) {
         let lang = cockpit.language;
@@ -3796,8 +3797,12 @@ function factory() {
         if (po_data) {
             const translated = po_data[key];
             if (translated?.[1])
-                return translated[1];
+                string = translated[1];
         }
+
+        if (test_l10n === 'true')
+            return "»" + string + "«";
+
         return string;
     };