Problem

When you have "edit source-text" enabled for a task and Plugin Spell-Check is active, Spell-Checker is also triggered for source-text. But, as far as i can see, with the rules of the target language.

See Screenshot for simple example:

This does not make sense.

Solution

Either use source-language for Spell-check in source-text or simply disable the whole Spell-Checking for source-texte