In manifest_version 2 it's possible to add a description string to a specific configuration option. However, this is mainly meant for developers or system-administrators, who use these configurations to set in LocalSettings.php or something else, so they know what it does (a bit like a replacement for missing comments in json). This string, however, isn't localized and can't be easily used in an on-wiki interface. So, there should be a possibility to add a message key, which can be used as a description when the configuration option (description) is used in an user interface.
|mediawiki/core||master||+4 -0||registration: Allow documenting config settings with i18n messages|
|Open||None||T388 Graphical configuration interface|
|Open||None||T155155 Implement a way to view (extension) configuration options and its value on-wiki|
|Resolved||Florian||T155157 Allow to define a localized description message to be added to extension configs|
I added the following documentation on mediawiki.org and will probably convert one extension (and link to this task :)):
@Legoktm: Sure! I added it in this way: https://www.mediawiki.org/w/index.php?title=Manual%3AExtension.json%2FSchema&type=revision&diff=2417816&oldid=2410949 I'm not sure, if this is correct or the best format, so feel free to edit, if needed :D