patch 9.0.1594: some internal error messages are translated

Problem:    Some internal error messages are translated.
Solution:   Consistently do not translate internal error messages.
            (closes #12459)
diff --git a/src/blowfish.c b/src/blowfish.c
index 6a33914..95d14cc 100644
--- a/src/blowfish.c
+++ b/src/blowfish.c
@@ -416,7 +416,7 @@
     keylen = (int)STRLEN(key) / 2;
     if (keylen == 0)
     {
-	iemsg(_(e_bf_key_init_called_with_empty_password));
+	iemsg(e_bf_key_init_called_with_empty_password);
 	return;
     }
     for (i = 0; i < keylen; i++)