patch 7.4.1820
Problem:    Removing language from help tags too often.
Solution:   Only remove @en when not needed. (Hirohito Higashi)
diff --git a/src/version.c b/src/version.c
index 0191775..4dafb84 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1820,
+/**/
     1819,
 /**/
     1818,