To change language from English to Portuguese Brasil

Find

$rcmail_config['locale_string'] = ‘en’;

Replace it to

$rcmail_config['locale_string'] = ‘pt_BR’;

You can see the installed languages such as fr(french), en_US(english US) from the folder /usr/local/cpanel/base/roundcube/program/localization.

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cd /usr/local/cpanel/base
rm -rf roundcube*
mysql
mysql>drop database roundcube;
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Before starting the installation, you need to know the root password of Mysql.
Lets proceed….

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cd /usr/local/cpanel/base
wget http://easynews.dl.sourceforge.net/sourceforge/roundcubemail/roundcubemail-0.1beta2.1.tar.gz
tar -zxvf roundcubemail-0.1beta2.1.tar.gz
mv -f roundcubemail-0.1beta2 roundcube
cd roundcube
chmod -R 777 temp
chmod -R 777 logs
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Create the database. Find mysql root password from /root/.my.cnf.
Login as user, root.

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mysql -u root -p
Password:
mysql>CREATE DATABASE roundcube;
mysql>use roundcube;
mysql>source SQL/mysql.initial.sql;
mysql>quit
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Add the configuration:

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cd config
mv db.inc.php.dist db.inc.php
mv main.inc.php.dist main.inc.php
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Edit the configuration files

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using your text editor edit db.inc.php

Find:
$rcmail_config['db_dsnw'] = ‘mysql://roundcube:pass@localhost/roundcubemail’;
Replace with:
$rcmail_config['db_dsnw'] = ‘mysql://root:rootpass@localhost/roundcube’;
#vi main.inc.php
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Replace the corresponding root password

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using your text editor edit main.inc.php
Find:
$rcmail_config['default_host'] = ”;
Replace with:
$rcmail_config['default_host'] = ‘localhost’;
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Configure cPanel to show roundcube in the theme. X theme(default) only!!

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cd /usr/local/cpanel/base/roundcube/skins/default/images/
cp roundcube_logo.png /usr/local/cpanel/base/frontend/x/images/roundcube_logo.png
cp roundcube_logo.png /usr/local/cpanel/base/webmail/x/images/roundcube_logo.png
wget http://www.yourserverguide.com/Files/HGpatch-roundcube-1.0BETA2.1
patch -p0 < HGpatch-roundcube-1.0BETA2.1
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If you receive a message stating: Reversed (or previously applied) patch detected! Assume -R? Please press N for No as this is because you previously installed roundcube

This will auto do all the necessary changes to roundcube and the X theme. Once the patch is executed you may now access roundcube via http://yourdomain/webmail