* gui: Allow to translate and fix incorrect Versions date filter ranges
Translate the previously English-only ranges used in Versions date
filter. In the process, fix the currently incorrect range calculation.
For instance, let us say it is 08:05. Selecting "today" should set the
range to start at 00:00 and end at 08:05. However, what really happens
is that both start and end are set to 08:05, and as a result "today" is
never shown to the user. The case is the same for "yesterday", which in
contrary to "today" is shown, but its range is fixed at 08:05 on the
previous day.
This commit fixes the above by always calculating "today" starting at
00:00 up to the current moment, and calculating "yesterday" from 00:00
on the previous to 00:00 on the current day.
When it comes to "last x days", the commit fixes the calculation so that
it actually covers the whole day, which is done by moving the start date
to 00:00 on the first day.
Signed-off-by: Tomasz Wilczyński <twilczynski@naver.com>