Let's start with a very clear warning: this is an Alpha test release. It has only been in development for a month or so. That means don't whine about this, that or the other thing that doesn't work, or is missing, or whatever. Celebrate what does work, and appreciate the dedication and talent of the Manjaro community members who are working on this!
To that end, I will start the celebration here with: Hooray! It works! Here is the proof, a screen shot taken on my Raspberry Pi 2 yesterday evening:
LibreOffice 5.1 Officially Released with Redesigned User Interface, New Features