From 7c63bfc236d3f2cd0277d02f33e50b2295784db7 Mon Sep 17 00:00:00 2001
From: "Torsten Schulz (local)" <tsschulz@gmx.net>
Date: Sun, 16 Nov 2025 14:03:07 +0100
Subject: [PATCH] Enhanced locale determination logic to evaluate the
 Accept-Language header from the browser, allowing for improved locale
 selection based on user preferences. Updated fallback mechanism for locale
 handling.

---
 src/app.cpp | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/src/app.cpp b/src/app.cpp
index 2e31084..fb21fb9 100644
--- a/src/app.cpp
+++ b/src/app.cpp
@@ -140,14 +140,27 @@ Wt::WLocale App::determineLocaleFromBrowser() const {
         }
     }
 
-    // 2. Sonst Locale verwenden, die Wt bereits aus dem Browser/Request ermittelt hat
+    // 2. Accept-Language Header des Browsers auswerten
+    std::string accept = env_.headerValue("Accept-Language");
+    if (!accept.empty()) {
+        std::stringstream ss(accept);
+        std::string part;
+        while (std::getline(ss, part, ',')) {
+            auto localeName = mapLanguageTag(part);
+            if (!localeName.empty()) {
+                return makeLocale(localeName);
+            }
+        }
+    }
+
+    // 3. Sonst Locale verwenden, die Wt bereits aus dem Request ermittelt hat
     auto envLocaleName = env_.locale().name(); // z.B. "de_DE", "en_GB"
     auto mapped = mapLanguageTag(envLocaleName);
     if (!mapped.empty()) {
         return makeLocale(mapped);
     }
 
-    // Fallback: britisches Englisch
+    // 4. Fallback: britisches Englisch
     return makeLocale("en_GB");
 }