Details for https://github.com/orgs/unraid/projects/1/views/1?query=sort:updated-desc+is:open&pane=issue&itemId=68869325

Available languages are in this json file:
https://assets.ca.unraid.net/feed/languageSelection.json
The URL for this file has changed effective October 10, 2024

Assuming the user picks the bn_BN option, download the URL for that language, such as:
https://raw.githubusercontent.com/unraid/language-templates/master/limetech/lang-bn_BN.xml
and place on the flash drive as:
/config/plugins/lang-bn_BN.xml

Then parse that xml file for the LanguageURL, such as:
https://github.com/unraid/lang-bn_BN/archive/master.zip
download that zip file and place on the flash drive under this name:
/config/plugins/dynamix/lang-bn_BN.zip (note: rename from master.zip)

Then modify this file:
/config/plugins/dynamix/dynamix.cfg
and change this:
locale=""
to this:
locale="bn_BN"

When the system boots the new language will be installed and enabled by default