Outgoing calls are badly localized. I presume this is because in english there's just one text "calling", regardless if the call is incoming or outgoing. This works fine for both in english as it can be understood as "someone is calling you" or "you are calling someone".
In german however, this is translated to "ruft an" which works fine for incoming calls, but doesn't work for outgoing calls as this explicitly says "... is calling".
The strings for incoming/outgoing calls should be different, with some context for the translator.
phablet@ubuntu-phablet:~$ system-image-cli -i
current build number: 2
device name: krillin
channel: devel
alias: ubuntu-touch/vivid
last update: 2015-04-14 21:59:09
version version: 2
version ubuntu: 20150413
version device: 20150326-f0c5ba5
version custom: 20150413
Thanks, in what Ui exactly is that showing?