diagnostics: add missing translation

[Akim Demaille]

commit cce6c998b6c696ce5d289db1a34cecab2782a2c9
Author: Akim Demaille <address@hidden>
Date:   Sun Nov 3 09:09:13 2019 +0100

    diagnostics: add missing translation
    
    * src/muscle-tab.c (muscle_percent_define_check_kind): Here.

diff --git a/src/muscle-tab.c b/src/muscle-tab.c
index 02c83530..cc7dbdf6 100644
--- a/src/muscle-tab.c
+++ b/src/muscle-tab.c
@@ -21,13 +21,13 @@
 #include "system.h"
 
 #include <hash.h>
+#include <quote.h>
 
 #include "complain.h"
 #include "files.h"
 #include "fixits.h"
 #include "getargs.h"
 #include "muscle-tab.h"
-#include "quote.h"
 
 muscle_kind
 muscle_kind_new (char const *k)
@@ -626,17 +626,17 @@ muscle_percent_define_check_kind (char const *variable, 
muscle_kind kind)
         {
         case muscle_code:
           complain (&loc, Wdeprecated,
-                    "%%define variable '%s' requires '{...}' values",
+                    _("%%define variable '%s' requires '{...}' values"),
                     variable);
           break;
         case muscle_keyword:
           complain (&loc, Wdeprecated,
-                    "%%define variable '%s' requires keyword values",
+                    _("%%define variable '%s' requires keyword values"),
                     variable);
           break;
         case muscle_string:
           complain (&loc, Wdeprecated,
-                    "%%define variable '%s' requires '\"...\"' values",
+                    _("%%define variable '%s' requires '\"...\"' values"),
                     variable);
           break;
         }