Translation of spell-checker's messages

Translation of spell-checker's messages

Daniel Mikšík - દ્વારા
Number of replies: 0
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What file(s) should I look for if I would like to have the buttons and messages of the spell checker translated? I tried to translate the lib/editor/plugins/SpellChecker/lang/en.js into Czech, but to no avail.
Only later did I find out that the messages appearing on the screen are actually those in the lib/speller folder. But I can't see how to translate them. Am I missing something or are they hard coded really? (I'm using Moodle 1.5.2+.)
Thank you.