If you’re only getting these warnings now, then you must not have updated your system in a long time, because those issues date back at least 7 months already.
Manjaro is a (curated) rolling-release distribution and must be kept up to date, as well as that it must be maintained. I am willing to bet that you’ve got a load of unattended .pacnew files on your system as well.
First things first, you can remedy your problem with the following command… 
sudo pacman-mirrors -f && sudo pacman -Syuu kpeoplevcard pacman-contrib --overwrite "/usr/lib/locale/*"
After the above, run the command…
pacdiff -o
… to see how many .pacnew files you have, and then merge them. Do not blindly copy them over your existing configuration files, but inspect their contents and merge them in with your existing configuration files.
Lastly, please read the following essay…