Description of problem:
There are original description and patch.
http://community.livejournal.com/logjam_dev/32991.html?#cutid1

Cite.
"I found it frustrating that LogJam 4.5.3 ignored spell check language change in 
settings until I create new entry, because by the time I realise that the 
language is wrong I usually had some text already typed and I had to cut-new-
paste-and-retype-subject each time. So I investigated a little and came up with 
the following patch which allows to change GtkSpell language while typing an 
entry."

Applicable version of logjam is 4.5.3.