chat-view: Split new SMS conversation message in two lines

The message for new SMS conversations is too long for some
screens and prevents both the end of the message and the "Send"
button to be visible on the screen. Split the message into
two lines to improve readability and allow sending the message
without requiring to rotate the phone.
7 jobs for new-sms-message in 8 minutes and 38 seconds (queued for 2 seconds)
latest
Status Name Job ID Coverage
  Build
passed build-pureos-gcc-byzantium #359275
librem5

00:01:35

 
  Test
passed check-po #359277
librem5

00:00:18

passed test:debian-gcc #359276
librem5

00:01:27

23.4%
 
  Package
passed package-pureos-byzantium #359278
librem5

00:01:43

passed package-pureos-byzantium:arm64 #359279
librem5:arm64

00:05:35

 
  Test Package
passed autopkgtest-pureos-byzantium-package #359280
librem5

00:01:08

passed lintian-pureos-byzantium-package #359281
librem5

00:00:41