Add static scripts

static/scripts/language-select.js

@@ -0,0 +1,27 @@
+/**
+ * Select website language based on browser language
+ * @param currentLang {string}
+ * @param langs {Object.<string, string>}
+ * @param defaultLang {string}
+ */
+function selectWebsiteLanguage(currentLang, langs, defaultLang) {
+    const key = "initialLangSelected";
+    const isInitialLangSelected = localStorage.getItem(key) === "true";
+    const browserLang = navigator.language.split("-")[0];
+    if (!isInitialLangSelected) {
+        localStorage.setItem(key, "true");
+        if (browserLang === currentLang) {
+            return;
+        }
+        let languageBrowserUrl = langs[defaultLang];
+        const langIsSupported = langs[browserLang] !== undefined;
+        if (langIsSupported) {
+            languageBrowserUrl = langs[browserLang];
+        }
+        window.location.replace(languageBrowserUrl);
+    }
+}
+
+try {
+module.exports = { selectWebsiteLanguage };
+} catch (e) {}