Replacing Localized Text

To replace Japanese text or Chapter 1 English text, edit the JSON lang files.

To replace Chapter 2+ English text, replace the dialogue in the WAD file (usually by opening UTMT, searching for the dialogue in the code via Ctrl+Shift+F, and then replacing it).

Custom Handling

You can add a custom handler for all localized text in Chapter 1 by using gml_GlobalScript_scr_84_get_lang_string.

function scr_84_get_lang_string(arg0) {
    var value = ds_map_find_value(global.lang_map, arg0);
    // do stuff with `value`
    return value;
}

In Chapter 2 onwards, alongside removing the lang strings from being easily accessible, the code to access them has been changed.

function scr_84_get_lang_string(arg0) {
    var lang_string_id = arg0;
    var str = ds_map_find_value(global.lang_map, lang_string_id);
    
    if (is_undefined(str))
    {
        if (!ds_map_find_value(global.lang_missing_map, lang_string_id))
            ds_map_add(global.lang_missing_map, lang_string_id, true);
        
        str = "--missing-string--";
    }
    
    // do stuff with `str`
    return str;
}

On top of that this script only runs if is_english() is false.

Instead of trying to use scr_84_get_lang_string(), try using msgsetloc() as shown below:

function msgsetloc(arg0, arg1, arg2)
{
    var msg_index = arg0;
    var str = arg1;
    var localized_string_id = arg2;
    
    if (!is_english())
        str = scr_84_get_lang_string(localized_string_id);
    
    msgset(msg_index, str);
}