File list (Check if you may need any files):
include
.......\js
.......\..\pl_pl.lang.js
.......\language
.......\........\pl_pl.lang.php
modules
.......\Accounts
.......\........\language
.......\........\........\pl_pl.lang.php
.......\Administration
.......\..............\language
.......\..............\........\pl_pl.lang.php
.......\Calendar
.......\........\language
.......\........\........\pl_pl.lang.php
.......\Campaigns
.......\.........\language
.......\.........\........\pl_pl.lang.php
.......\com_vtiger_workflow
.......\...................\language
.......\...................\........\pl_pl.lang.php
.......\Contacts
.......\........\language
.......\........\........\pl_pl.lang.php
.......\CustomerPortal
.......\..............\language
.......\..............\........\pl_pl.lang.php
.......\CustomView
.......\..........\language
.......\..........\........\pl_pl.lang.php
.......\Dashboard
.......\.........\language
.......\.........\........\pl_pl.lang.php
.......\Deadline
.......\........\language
.......\........\........\pl_pl.lang.php
.......\Documents
.......\.........\language
.......\.........\........\pl_pl.lang.php
.......\Emails
.......\......\language
.......\......\........\pl_pl.lang.php
.......\Faq
.......\...\language
.......\...\........\pl_pl.lang.php
.......\FieldFormulas
.......\.............\language
.......\.............\........\pl_pl.lang.php
.......\Help
.......\....\language
.......\....\........\pl_pl.lang.php
.......\HelpDesk
.......\........\language
.......\........\........\pl_pl.lang.php
.......\Home
.......\....\language
.......\....\........\pl_pl.lang.php
.......\Import
.......\......\language
.......\......\........\pl_pl.lang.php
.......\Invoice
.......\.......\language
.......\.......\........\pl_pl.lang.pdf.php
.......\.......\........\pl_pl.lang.php
.......\Leads
.......\.....\language
.......\.....\........\pl_pl.lang.php
.......\Migration
.......\.........\language
.......\.........\........\pl_pl.lang.php
.......\Operation
.......\.........\language
.......\.........\........\pl_pl.lang.php
.......\PBXManager
.......\..........\language
.......\..........\........\pl_pl.lang.php
.......\PickList
.......\........\language
.......\........\........\pl_pl.lang.php
.......\Portal
.......\......\language
.......\......\........\pl_pl.lang.php
.......\Potentials
.......\..........\language
.......\..........\........\pl_pl.lang.php
.......\PriceBooks
.......\..........\language
.......\..........\........\pl_pl.lang.php
.......\Products
.......\........\language
.......\........\........\pl_pl.lang.php
.......\Project
.......\.......\language
.......\.......\........\pl_pl.lang.php
.......\PurchaseOrder
.......\.............\language
.......\.............\........\pl_pl.lang.pdf.php
.......\.............\........\pl_pl.lang.php
.......\Quotes
.......\......\language