You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: dynamic_filter_lang.m
    path of file: ./repos/acycle/code/misc
    
    the code of the file until where you have to start completion: % 2019: Dynamic filtering of a frequency in the depth domain with user-defined 
% lower boundary, average frequency, and upp
    
function [xdata_filtered,time,freqboundlow,freqboundhigh]=dynamic_filter_lang(data,window,step,fmin,fmax,unit,norm,padding)
    lang_choice = load('ac_lang.txt');
    langdict = readtable('langdict.xlsx');
    lang_id = langdict.ID;
    if lang_choice == 0
        % English
        lang_var = langdict.en;
    elseif lang_choice == 1
        % Chinese
        lang_var = langdict.cn;
    end