Use explicit widget language code

public/widget.js

@@ -2,7 +2,7 @@
   const boot = window.MaalFlows || {};
   const apiBase = (boot.apiBase || "").replace(/\/$/, "") || new URL(document.currentScript.src).origin;
   const siteKey = boot.siteKey || "9b-plus";
-  const lang = detectPageLanguage(boot);
+  const lang = normalizeLanguage(boot.lang);
   const storageKey = `maalflows:${siteKey}`;
   const pendingStorageKey = `${storageKey}:pending`;
   const session = loadSession();
@@ -13,10 +13,7 @@
 
   fetch(`${apiBase}/api/widget/config?${new URLSearchParams({
     siteKey,
-    lang,
-    pageLang: document.documentElement.lang || "",
-    currentUrl: location.href,
-    browserLang: navigator.language || ""
+    lang
   })}`)
     .then((res) => res.json())
     .then((config) => mount(config))
@@ -506,16 +503,6 @@
     };
   }
 
-  function detectPageLanguage(boot) {
-    const fromBoot = normalizeLanguage(boot.lang);
-    if (fromBoot) return fromBoot;
-    const fromUrl = normalizeLanguage(location.pathname.split("/").filter(Boolean)[0]);
-    if (fromUrl) return fromUrl;
-    const fromHtml = normalizeLanguage(document.documentElement.lang);
-    if (fromHtml) return fromHtml;
-    return normalizeLanguage(navigator.language) || "cs";
-  }
-
   function normalizeLanguage(value) {
     const text = String(value || "").trim().toLowerCase().replace("_", "-");
     const match = text.match(/^[a-z]{2,3}/);