Although Lotus Quickr 8.5 does support multiple languages by selecting the desired language in the browser, the online help is only available in English by default. If you need to replace the online help with a different language, please follow the instructions in this Wiki article.
This will replace the english help with the one you choose.
If you want to have the online help available in more than one language, you can save more than one MAIN.NSF in the help directory with different names. You then can place an additional link to that database in your custom theme.