Since ScummVM 0.10.0 there has been unannounced support for subtitles in the Broken Sword 1 cutscenes.
Now we finally managed to provide a package with subtitles for the following languages: English, Brazilian, German, Spanish, French, Italian and Russian. Also, subtitles for the English demo are provided.
You can grab the package from the downloads page.
At the moment we still lack Czech subtitles, thus if you're willing to help us with providing them, please contact sev.