update template

template/externs/webextension_polyfill/i18n/LanguageCode.hx

@@ -0,0 +1,9 @@
+package webextension_polyfill.i18n;
+
+/**
+	An ISO language code such as <code>en</code> or <code>fr</code>. For a complete list of languages supported by this
+	method, see <a href='http://src.chromium.org/viewvc/chrome/trunk/src/third_party/cld/languages/internal/languages.cc'>
+	kLanguageInfoTable</a>. For an unknown language, <code>und</code> will be returned, which means that [percentage]
+	of the text is unknown to CLD
+**/
+typedef LanguageCode = String;