In index.html create functions for translate

[dallaszkorben]

In index (228)
create functions for translate the be able to get back default values. Now if the key is not found then empty string will be returned.
I already created it for level:

    function get_translated_level(level){
        if (translated_levels.hasOwnProperty(level)) {
            return translated_levels[level];
        } else {
            return level;
        }
    }