The Playground side in the options to indicate can insert and into texts over substitute symbols. (for multilinguality)
I don't understand this, but deduce from its language its a feature request not a bug report.
I don't understand this either.
Sorry for very bad english
The Idea was to use standard placeholders for certain data or links like, playground email start-link etc. (~~PLAYGROUND~~ ...)
And use the language texts for the subscription, depend on the selected standard language for the wiki.
This makes it possible to change the site name e.g. to "spielplatz" instead of "playground" by configuration, and the link easy changeable in all texts, including "lang"-wiki texts, instead of a hard definition like [[playground]].
Is don now by plugin. (i know dokuwiki and his code a bit better now)