Soy: Extend shortSubject to 72 chars

The default wrap value is 72. Conform to that.

Change-Id: I6ca5824831a48e90e1b697fb153102c7e38adbd8
diff --git a/Documentation/config-mail.txt b/Documentation/config-mail.txt
index 1adc8d9..af2bd98 100644
--- a/Documentation/config-mail.txt
+++ b/Documentation/config-mail.txt
@@ -201,7 +201,7 @@
 
 $change.shortSubject::
 +
-The subject limited to 63 characters, with an ellipsis if it exceeds that.
+The subject limited to 72 characters, with an ellipsis if it exceeds that.
 
 $change.ownerEmail::
 +
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/mail/send/ChangeEmail.java b/gerrit-server/src/main/java/com/google/gerrit/server/mail/send/ChangeEmail.java
index bc09488..3753334 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/mail/send/ChangeEmail.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/mail/send/ChangeEmail.java
@@ -458,10 +458,10 @@
     changeData.put("subject", subject);
     // shortSubject is the subject limited to 63 characters, with an ellipsis if
     // it exceeds that.
-    if (subject.length() < 64) {
+    if (subject.length() < 73) {
       changeData.put("shortSubject", subject);
     } else {
-      changeData.put("shortSubject", subject.substring(0, 60) + "...");
+      changeData.put("shortSubject", subject.substring(0, 69) + "...");
     }
 
     Map<String, Object> patchSetData = new HashMap<>();