Localtransformer also localizes Htmlhelp (.chm) files. It localizes both the text content and the images of the htmlhelp file.
For the localization of the text content it uses the same configuration as with the localization of HTML files.
For more information see HTML Files Localization. Localtransformer also recognizes
if the localized language is a right to left language and builds an Htmlhelp File that has a right to left layout accordingly.