Indian Languages not available on Libreoffice Impress 5

I need to use Indian Language 'Marathi' to prepare a presentation. But there is no Marathi or Hindi to set as document language. Probably therefore even when I try to change the properties (e.g., font size) of the Marathi text I enter, things happen like the font won't get bigger even if I try to change it. How can I deal with it?