It's nav bar
I hope it will be added later, it's not depending on me, unfortunately (I'm not involved in ROM development for now, my java knowledge is not that great for now, so I'd avoid messing up with that, so I'm just doing a device maintenance). If that depended on me, man, I'd feature the hell out of this one, but my job is to keep device buildable, stable, updated and functional.
Keyboard may be messing with you because of gapps (I don't know which pack are you using, I had no issues with jajb's), but if that continues, just disable stock and use Google's or another one
You can always test and report here, because you have an variant (e989). Most users have e980s or e988s (myself too), and since device-stuff is for every e98x variant, every word and report means a lot, especially from variants.
You can see how things get strange when madmack's e980 modem works on your model, but doesn't work on mine (I've tried it a year ago, when I first flashed my phone - it didn't want to sleep no matter what I do, for 5 days tried everything - from roms, modems which soft-bricked me twice, build.prop hacks, and in the end returned it back to stock and just said f*** it and flashed a clean rom, without app backup and bang - problems were solved until I restored damn mail settings backup - bad password
), so many other things work for someone, someone else has crazy amount of problems, and someone doesn't have problems at all.
Your english is just fine
Greetings and thank you