patch 9.1.0509: not possible to translate Vim script messages

Problem:  not possible to translate Vim script messages
          (RestorerZ)
Solution: implement bindtextdomain() and gettext() to support Vim script
          message translations (Christ van Willegen)

fixes: #11637
closes: #12447

Signed-off-by: Christ van Willegen <cvwillegen@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/po/fixfilenames.vim b/src/po/fixfilenames.vim
index 04bc079..c92839e 100644
--- a/src/po/fixfilenames.vim
+++ b/src/po/fixfilenames.vim
@@ -4,7 +4,7 @@
 set shortmess+=A
 
 for name in argv()[1:]
-  let jsname = fnamemodify(name, ":t:r") .. ".js"
+  let jsname = fnamemodify(name, ":r:gs?\\~?_?:gs?\\.?_?:gs?/?__?:gs?\\?__?") .. ".js"
   exe "%s+" .. jsname .. "+" .. substitute(name, '\\', '/', 'g') .. "+"
 endfor