I attached an updated version for Sigil 0.9.7 with cursor positioning support to the first post.
I.e., if you click an error message it'll move the cursor to the word that was flagged. (Occasionally, the cursor position might be off by a couple characters.)
This should make it easier to find the words flagged by LanguageTool.
BTW, the LanguageTool developers have released a new standalone LanguageTool version:
LanguageTool 0.3.6