The replacement of the "@SUBSCRIBE@" placeholder is not done anymore in the inc/lang/*/subscr_single.txt file, resulting in mails sent to users with this not-replaced placeholder.
However, based on the english language file, a "new" placeholder is used: "@NEWPAGE@"
Therefore I just changed the old "@SUBSCRIBE@" by the new "@NEWPAGE@" in all the subscr_single.txt lang files.
No more "@SUBSCRIBE@" in inc/lang/*/subscr_single.txt files, replaced…
… with "@NEWPAGE@"
will be fixed with #125