--- a/CHANGES.txt	Thu Dec 25 12:14:53 2025 -0500
+++ b/CHANGES.txt	Thu Dec 25 14:04:09 2025 -0500
@@ -41,7 +41,9 @@
   a multilink link "messages" that does not have a 'name' property
   causes a crash. (found/fix by cmeerw; commit and better handling of
   non-labeled multilink by John Rouillard)
-  
+- in cgi/client.py, set self.language attribute when translator passed
+  into Client(). (John Rouillard)
+
 Features:
 
 - add support for authorized changes. User can be prompted to enter

--- a/roundup/cgi/client.py	Thu Dec 25 12:14:53 2025 -0500
+++ b/roundup/cgi/client.py	Thu Dec 25 14:04:09 2025 -0500
@@ -452,9 +452,12 @@
         self.env = env
         if translator is not None:
             self.setTranslator(translator)
-            # XXX we should set self.language to "translator"'s language,
-            # but how to get it ?
-            self.language = ""
+            # set self.language to "translator"'s language
+            try:
+                self.language = translator.info()["language"]
+            except (AttributeError, KeyError):
+                # info() missing or no language key
+                self.language = ""
         else:
             self.setTranslator(TranslationService.NullTranslationService())
             self.language = ""  # as is the default from determine_language