patch 9.1.0229: Error E877 is not translated

Problem:  Error E877 is not translated (RestorerZ)
Solution: Declare the error with N_ to mark it as translatable, add _()
          around the error message in regexp_nfa.c

fixes: #14333

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/errors.h b/src/errors.h
index 18d3f0c..00f7df0 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -2268,7 +2268,7 @@
 EXTERN char e_nfa_regexp_not_enough_space_to_store_whole_nfa[]
 	INIT(= N_("E876: (NFA regexp) Not enough space to store the whole NFA"));
 EXTERN char e_nfa_regexp_invalid_character_class_nr[]
-	INIT(= "E877: (NFA regexp) Invalid character class: %d");
+	INIT(= N_("E877: (NFA regexp) Invalid character class: %d"));
 EXTERN char e_nfa_regexp_could_not_allocate_memory_for_branch_traversal[]
 	INIT(= N_("E878: (NFA regexp) Could not allocate memory for branch traversal!"));
 #ifdef FEAT_SYN_HL
diff --git a/src/regexp_nfa.c b/src/regexp_nfa.c
index 359ce5b..5e4fadd 100644
--- a/src/regexp_nfa.c
+++ b/src/regexp_nfa.c
@@ -5150,7 +5150,7 @@
 
 	default:
 	    // should not be here :P
-	    siemsg(e_nfa_regexp_invalid_character_class_nr, class);
+	    siemsg(_(e_nfa_regexp_invalid_character_class_nr), class);
 	    return FAIL;
     }
     return FAIL;
diff --git a/src/version.c b/src/version.c
index 2a996a1..017ccdb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    229,
+/**/
     228,
 /**/
     227,