Update spanish translation of user manual to english a0098a8

Signed-off-by: Salvador Cuñat <salvador.cunat@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Add dive: initialize start time of dive

commit f29f41ae9ea8 ("Planner: fix start time handling") broke the start
time handling for Add dive. While in actual planner mode we set the start
time for the plan, we did not do this when simply adding a dive. The
moment the time / date was changed (which admittedly in real life a user
would most likely do) all was well, but if the user just accepted the
"now + 1h" default, things went badly wrong.

Fixes #658
See #655

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>