intenta con far manager subir el archivo customize_upgrade.xml a la carpeta /tpa/preset/custom
customize_upgrade.xml debe contener lo siguiente:
<?xml version="1.0" encoding="UTF-8"?>
<customization>
<info>
<country>World</country>
<operator>Generic Trade</operator>
<language-variant-name>WorldWide</language-variant-name>
<allowed-language>ar</allowed-language>
<allowed-language>he</allowed-language>
<allowed-language>ru</allowed-language>
<allowed-language>bg</allowed-language>
<allowed-language>el</allowed-language>
<allowed-language>tr</allowed-language>
<allowed-language>sv</allowed-language>
<allowed-language>fi</allowed-language>
<allowed-language>sr</allowed-language>
<allowed-language>sl</allowed-language>
<allowed-language>sk</allowed-language>
<allowed-language>ro</allowed-language>
<allowed-language>pt</allowed-language>
<allowed-language>pl</allowed-language>
<allowed-language>no</allowed-language>
<allowed-language>nl</allowed-language>
<allowed-language>hu</allowed-language>
<allowed-language>lt</allowed-language>
<allowed-language>lv</allowed-language>
<allowed-language>it</allowed-language>
<allowed-language>hr</allowed-language>
<allowed-language>fr</allowed-language>
<allowed-language>es</allowed-language>
<allowed-language>en</allowed-language>
<allowed-language>et</allowed-language>
<allowed-language>de</allowed-language>
<allowed-language>da</allowed-language>
<allowed-language>cs</allowed-language>
<allowed-language>is</allowed-language>
<allowed-language>ja</allowed-language>
<allowed-language>bn</allowed-language>
<allowed-language>hi</allowed-language>
<allowed-language>uk</allowed-language>
<allowed-language>st</allowed-language>
<allowed-language>zu</allowed-language>
<allowed-language>sq</allowed-language>
<allowed-language>fa</allowed-language>
<allowed-language>id</allowed-language>
<allowed-language>ms</allowed-language>
<allowed-language>tl</allowed-language>
<allowed-language>th</allowed-language>
<allowed-language>vi</allowed-language>
<allowed-language>zc</allowed-language>
<allowed-language>zh</allowed-language>
<allowed-language>zt</allowed-language>
<allowed-language>zs</allowed-language>
<allowed-language>ae</allowed-language>
<allowed-language>xl</allowed-language>
<allowed-language>cf</allowed-language>
<allowed-language>pb</allowed-language>
</info>
</customization>
Lo haces con el notepad o cualquier editor de texto. Espero sirva :D
El costum solo hace "referencia" o como decimos los programadores "llama" a los archivos de los lenguajes instalados en el celular. Si tu celular tiene un firmware con solo inglés,español y portugués por más que le pongas 30 ó 40 idiomas en el costum no los vas a poder configurar en el celular.Es necesario instalar lenguajes adicionales (archivos .lng)