I am trying to use language substitutions in a cb subs promotion but the substitutions are not displayed, just the [substitution_string] key. The keys and substitution texts appear as expected in the override section of the default language override tab. I have tried both the append and the custom version of display modification. I know the substitution is active because I can use it in a plan name and it works.

On the Display tab of the Promotion, in these fields

Plan name override
Plan description override

I thought it might be an interaction with the existing data, such as existing Plan name, but the language key doesn't work even it the Display tab is set to Custom (replacing normal plan name and description

I made the changes in the CB default language plugin through the override.php file, confirming them in the plugin via the administrator interface. I installed the CB Subs english language plugin and tried it there and had more success, but not complete. If the promotion display is set replace the strings are displayed correctly, but if it is set to append, the strings defined by the CB Subs language plugin are displayed correctly but the ones defined by CB default language display the key and not the substitution.

I have installed the most recent nightly build to test this, and there are no trailing spaces in the substitution strings.

I was puzzled by your suggestion to try the CB Subs language plugin because in my previous work on language substitutions I saw the following:

krileon wrote: Add your CBSubs language overrides to your CB language plugin. CBSubs has no loading behavior for the overrides file (although CB will create it). CBSubs language files are basically legacy now since we've support for plugin language files already in CBs language loading behavior.

It appears this is no longer the case, and that language substitutions for CB subs should be done via separate CB subs language plugins and not the CB language plugins, please confirm.