Incidentally, for those who are not familiar with this feature, when you launch the RuneScape client, on the screen that asks you to log in, there is the word "Language" in the upper left corner.
It is by clicking on this that you can switch the language you are using, allowing you to log into the worlds where these other languages are in use - messages from RuneScape will now be in the selected language.
26-Apr-2017 20:27:19