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I want to add a field under Localization > Date Formats. What is the correct procedure to do this?
This is what I tried. I added an entry in Localization.settings.php, CRM/Admin/Form/Setting.php's $_settings array property and CRM/Core/Config/MagicMerge.php and, added a corresponding record on civicrm_settings table and cleared the cache. The field is not showing up. What am I missing?
I wouldn't do this by editing core files. I would implement the buildForm and postProcess hooks in a module extension.
https://wiki.civicrm.org/confluence/display/CRMDOC/Create+a+Module+Extension
https://wiki.civicrm.org/confluence/display/CRMDOC/Hook+Reference
But having said that I probably also wouldn't add it to a core form, I would make a settings page for my extension, which is just a module extension that implements the "add a basic web form" instructions at the first link.
