We just uploaded new version to repository. In this version we added smart word spelling. Now words will check only from correct dictionary and will not highlight words, which have no dictionaries. For example, Russian word can be completed only by suggestions from Russian dictionary, and can be checking only by Russian dictionary etc.
+Note: This plugin does not have dictionaries on board. You must install also plugins: "Spell Checker English Dictionary", "Spell Checker German Dictionary" or/and "Spell Checker Russian Dictionary" to enable spelling for language you need.
The word completion feature still beta, and we will be glad to any feedback about it. Also we have a tracker:
Sergiy Dubovik and Alexey Efimov