Farewell to Bram and dedicate upcoming Vim 9.1 to him (#12749)

* Dedicate upcoming Vim 9.1 to Bram

Also replace in a few more places Brams email address and mention new
maintainers.

* Remove Bram from any Maintainer role

* runtime: Align Header

* it's mailing list not mailinglist
diff --git a/src/po/README.txt b/src/po/README.txt
index be09aa1..8ec1b59 100644
--- a/src/po/README.txt
+++ b/src/po/README.txt
@@ -90,7 +90,7 @@
     Remove the "#, fuzzy" line after adding the translation.
 
     There is one special message:
-	msgid "Messages maintainer: Bram Moolenaar <Bram@vim.org>"
+	msgid "Messages maintainer: The Vim Project"
     You should include your name and E-mail address instead, for example:
 	msgstr "Berichten übersetzt bei: John Doe <john@doe.org>"