Add 642f5233205bca3bbc7cb2d30288386b38312e92 to ignore list.

That commit did only change an error in the voice strings and hasn't been a
language update. Ignore it to give the correct "Last Update" value in the list.
diff --git a/ignoredhash.list b/ignoredhash.list
index 846517b..308fc63 100644
--- a/ignoredhash.list
+++ b/ignoredhash.list
@@ -1,3 +1,4 @@
+642f5233205bca3bbc7cb2d30288386b38312e92
 aec2f31364627d0cb4f91ab007e5a1dbd58071c3
 d1fd4f08f56f6dd46b26b1f41baff425ca71d498
 142725ebc9c94b1afe81c7a3d33b8175b93ef27c