Hello, here I am sharing my scripts
My first include
download the here include
ClickyFunctionsGetPlayerLanguage(playerid);
SetPlayerLanguage(playerid,language);
SendLanguageMessage(playerid,color,english[],portuguese[]);
SendLanguageMessageToAll(color,english[],portuguese[]);
Examplespublic OnPlayerCommandText( playerid, cmdtext[] )
{
	if ( strcmp( cmd, "pt", true ) == 0 )
	{
		SendClientMessage(playerid, -1, "His language was changed to Portuguese");
		SetPlayerLanguage(playerid,Portuguese);
		return 1;
	}
	else if ( strcmp( cmd, "en", true ) == 0 )
	{
		SendClientMessage(playerid, -1, "His language was changed to English");
		SetPlayerLanguage(playerid,English);
		return 1;
	}
	else if ( strcmp( cmd, "language", true ) == 0 )
	{
		SendLanguageMessage(playerid,-1,"His language is English","Sua linguagem e Portuguese");
		return 1;
	}
	else if ( strcmp( cmd, "languageall", true ) == 0 )
	{
		SendLanguageMessageToAll(-1,"Welcome","Bem Vindos");
		return 1;
	}
    return 0;
}Credits: MeAny error or doubt post here
Sorry for my english