move translated languages to metrics

stepmania/src/ScreenOptionsMasterPrefs.cpp

@@ -194,7 +194,7 @@ static void LanguageChoices( vector<RString> &out )
 	{
 		const LanguageInfo *pLI = GetLanguageInfo( *s );
 		if( pLI )
-			out.push_back( pLI->szNativeName );
+			out.push_back( THEME->GetString("NativeLanguageNames", pLI->szEnglishName) );
 		else
 			out.push_back( *s );
 	}

stepmania/src/ScreenSelectLanguage.cpp

@@ -22,7 +22,7 @@ void ScreenSelectLanguage::Init()
 		gc.m_sName = *s;
 		gc.m_bInvalid = false;
 		if( pLI )
-			gc.m_sText = pLI->szNativeName;
+			gc.m_sText = THEME->GetString("NativeLanguageNames", pLI->szEnglishName);
 		else
 			gc.m_sText = *s;