UI text: fix caps and punctuation in QNX text

Change-Id: I5f09a1275806b93f777b6f6e8ebb3cad9cf1fa05
Reviewed-by: Tobias Nätterlund <tobias.naetterlund@kdab.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>