Fix "mistake||correction" delimiter for a number of entries in...

Fix "mistake||correction" delimiter for a number of entries in data/spelling/corrections-case. Thanks, Francois Gouget. (Closes: #931446)

You can find them all with:

    $ grep '[^\|]|[^\|]' data/spelling/corrections*
4 jobs for master in 94 minutes and 48 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #214650
stable-bpo

01:34:46

passed #214649
testing

01:18:15

passed #214648
unstable

01:22:19

 
  External
passed jenkins

03:13:18