update custom translations during upgrade

I don't understand how to upgrade to 7.2 and keep my translated files.

like written in this article http://www.boonex.com/trac/dolphin/wiki/Dol7UpgradeCustomTranslations

its says that i need to create a translated copy of lang_en.php for your custom language in the same directory.

i have already translated file online. do i have to re-translate the new (7.2) lang_en.php to my language in the

upgrade directory, or download the online lang file to the upgrade directory and upload it again??.... 

Always remember that the future comes one day at a time.
Quote · 16 Sep 2015
 
 
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