Increase string limits

These have been requested by the translators. For some reason the limits
were shorter than the actual source strings. Both these messages are
meant to be displayed alone on the screen, and 50 chars should fit
comfortably.

Bug: 8442366
Bug: 8442144

Change-Id: I7062e533e5d4521d2866a6c5f947c8f25b790675