patch 8.0.1773: dialog messages are not translated

Problem:    Dialog messages are not translated.
Solution:   Add N_() and _() where needed. (Sergey Alyoshin)
diff --git a/src/quickfix.c b/src/quickfix.c
index 1912702..acff1ec 100644
--- a/src/quickfix.c
+++ b/src/quickfix.c
@@ -4115,7 +4115,8 @@
     if (cmdmod.browse)
     {
 	char_u *browse_file = do_browse(0, (char_u *)_("Error file"), eap->arg,
-				   NULL, NULL, BROWSE_FILTER_ALL_FILES, NULL);
+				   NULL, NULL,
+				   (char_u *)_(BROWSE_FILTER_ALL_FILES), NULL);
 	if (browse_file == NULL)
 	    return;
 	set_string_option_direct((char_u *)"ef", -1, browse_file, OPT_FREE, 0);