patch 7.4.2306

Problem:    Default value for 'langremap' is wrong.
Solution:   Set the right value. (Jürgen Krämer)  Add a test.

src/version.c

@@ -763,6 +763,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2306,
 /**/
     2305,
 /**/