Use IETF language tags for configuring language

modules/webadmin.cpp

@@ -1381,7 +1381,7 @@ class CWebAdminMod : public CModule {
             l_en["Code"] = "";
             l_en["Name"] = "English";
             CTemplate& l_ru = Tmpl.AddRow("LanguageLoop");
-            l_ru["Code"] = "ru_RU";
+            l_ru["Code"] = "ru-RU";
             l_ru["Name"] = "Russian";
 #else
             Tmpl["HaveI18N"] = "false";

src/Translation.cpp

@@ -52,6 +52,7 @@ CString CTranslation::Plural(const CString& sDomain, const CString& sContext,
 
 const std::locale& CTranslation::LoadTranslation(const CString& sDomain) {
     CString sLanguage = m_sLanguageStack.empty() ? "" : m_sLanguageStack.back();
+    sLanguage.Replace("-", "_");
     if (sLanguage.empty()) sLanguage = "C";
 #ifdef HAVE_I18N
     // Not using built-in support for multiple domains in single std::locale