I upgrade the joomla version and now it appears the next problem in my Web Page, also i have this text with the code but I don't know coding and neither where to finde the file.

Text Translated: Update to .htaccess related to Content-Encoding header configuration Since version 4.2.9

Prior to version 4.2.9, the default htaccess.txt file contained incorrect code for adding the "Content-Encoding" HTTP header. This could result in double encoding errors when Joomla is installed in a subdirectory, and both this directory and its parent directory contain an .htaccess file with this code. You should manually apply the necessary changes to any existing .htaccess file, as this file cannot be updated automatically.

The old code:

Header append Content-Encoding gzip

The new code:

Header set Content-Encoding gzip