Rewrite the CHECK ALIVE help popup (ThresholdTimeWidget.help_text) to explain
both modes, keeping the <b>CHECK ALIVE</b> title bold:
- DATA mode: set the check-alive date; on wallet open, if the date has passed
the plugin asks whether to postpone the inheritance.
- RAW mode: when less than this time is missing, ask to invalidate; failing to
invalidate delivers the transactions to the heirs; kept the d/y suffix help.
Fix two typos within this help text: 'less then' -> 'less than',
'currrent' -> 'current'.
Bump version to 0.3.8 across the four version files. CHANGELOG entry #14.