diff --git a/addons/http_routing/models/ir_http.py b/addons/http_routing/models/ir_http.py
index b6d0361498a..643d378e9ce 100644
--- a/addons/http_routing/models/ir_http.py
+++ b/addons/http_routing/models/ir_http.py
@@ -246,12 +246,17 @@ class IrHttp(models.AbstractModel):
         modules = IrHttpModel.get_translation_frontend_modules()
         user_context = request.session.get_context() if request.session.uid else {}
         lang = user_context.get('lang')
-        translations, _ = request.env['ir.translation'].get_translations_for_webclient(modules, lang)
+        translations, lang_params = request.env['ir.translation'].get_translations_for_webclient(modules, lang)
+        translation_cache = {
+            'lang_parameters': lang_params,
+            'modules': translations,
+            'multi_lang': len(request.env['res.lang'].sudo().get_installed()) > 1,
+        }
 
         session_info.update({
             'translationURL': '/website/translations/',
             'cache_hashes': {
-                'translations': hashlib.sha1(json.dumps(translations, sort_keys=True).encode()).hexdigest(),
+                'translations': hashlib.sha1(json.dumps(translation_cache, sort_keys=True).encode()).hexdigest(),
             },
         })
         return session_info
diff --git a/addons/web/models/ir_http.py b/addons/web/models/ir_http.py
index f2bfc70f9b4..df316c582fd 100644
--- a/addons/web/models/ir_http.py
+++ b/addons/web/models/ir_http.py
@@ -32,10 +32,15 @@ class Http(models.AbstractModel):
         _, qweb_checksum = concat_xml(files)
 
         lang = user_context.get("lang")
-        translations_per_module, _ = request.env['ir.translation'].get_translations_for_webclient(mods, lang)
+        translations_per_module, lang_params = request.env['ir.translation'].get_translations_for_webclient(mods, lang)
+        translation_cache = {
+            'lang_parameters': lang_params,
+            'modules': translations_per_module,
+            'multi_lang': len(request.env['res.lang'].sudo().get_installed()) > 1,
+        }
 
         menu_json_utf8 = json.dumps(request.env['ir.ui.menu'].load_menus(request.session.debug), default=ustr, sort_keys=True).encode()
-        translations_json_utf8 = json.dumps(translations_per_module,  sort_keys=True).encode()
+        translations_json_utf8 = json.dumps(translation_cache,  sort_keys=True).encode()
 
         return {
             "uid": request.session.uid,