Do not use download accelerator to download translations. It will get error.
Translations Shack Spreadsheets
Shack Spreadsheets allows you to import spreadsheets to Joomla with the click of a button. The extension will automatically display your spreadsheet data in a clean HTML table. This really is the quickest and easiest way to take data from a spreadsheet and add it to your Joomla site.
Available Translations Shack Spreadsheets