patch 8.0.0835: translations check with msgfmt does not work

Problem:    Translations check with msgfmt does not work.
Solution:   Add a space before the file name.

Author: brammool

src/po/check.vim

@@ -146,7 +146,7 @@ endwhile
 " Check that the file is well formed according to msgfmts understanding
 if executable("msgfmt")
   let filename = expand("%")
-  let a = system("msgfmt --statistics OLD_PO_FILE_INPUT=yes" . filename)
+  let a = system("msgfmt --statistics OLD_PO_FILE_INPUT=yes " . filename)
   if v:shell_error != 0
     let error = matchstr(a, filename.':\zs\d\+\ze:')+0
     for line in split(a, '\n') | echomsg line | endfor

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    835,
 /**/
     834,
 /**/