Minor spacing issue

This will prevent future merge conflicts with the GTK+ 3.12 branch.
Updated Greek translation
Updated Polish translation
Next/prev buttons on either side of date in header bar: Bug #734511
Add no-c-format to gettext strftime strings: Bug #733223
Use the correct inline toolbar style for action buttons in the Calendar Manager
Allow user adjust start/end date/times either direction: Bug #734408

This allows for the start/end date/time widget to be freely adjusted
on either end of the range.  If the user attempts to set an invalid
value (start time after end time), the other widget will automatically
adjust attempting to preserve the current duration of time.
Don't adjust event duration in date/time editor while typing

Last commit had one serious shortcoming: if the user was typing a
multidigit hour, the maintained duration could swing wildly.  (For
example, typing a "1" then a "2" for 12 could make a 1-hour duration
become a 12-hour duration.)  This corrects that by only adjusting the
duration if the focus has left the GtkEntry.
Move View.Month to Toolkit.ButtonEventConnector

View.Week is already using it, better to have both using it and avoid
duplicate code and different logic structures.
Updated POTFILES.in
Show calendar when displaying an event: Bug #726140
Quick Add should allow numeric dates such as 7/2: Bug #732032

Numeric dates are now parsed.  California also determines
month-day-year ordering at startup.
Don't treat unadorned 3 or 4-digit nums as 24-hour time: Bug #734750

Allowing for "1900" to be treated as 7pm meant things like street
numbers would be treated as time.
Support time ranges with Quick Add: Bug #731485

Time ranges w/ dashes ("6p-9p") now supported by Quick Add.
Merge branch 'master' into wip/732029-gtk-312

Conflicts:
	src/host/host-show-event.vala