Added Serbian Cyrillic, Serbian Latin and Croatian, thanks Zsolt!
Don't bump installation version yet
CC-5696: Two shows or even three shows playing at once. Unstopable even after reboot
CC-5719: Incorrect show content start time

The show content was getting recalculated twice sometimes.
So if the difference between the original and now show start
date-time and was 2 hours, the scheduled content would have
a difference of 4 hours
CC-5718: Show content can get scheduled in instances that are in the past

Disabled scheduled content into instances that have already played out
Removed setting the show's start date to the first repeating instance's start date
because we already fixed that in CC-5697
CC-5724: Changing start date of a repeating show will update content incorrectly
Broke unit test for adding content to single show
CC-5725: Changing a show's repeat type removes first instance from repeating series
CC-5725: Changing a show's repeat type removes first instance from repeating series
CC-5725: Changing a show's repeat type removes first instance from repeating series
CC-5725 Changing a show's repeat type removes first instance from repeating seriesCC-5726: Write database test cases for CC-5725
Fixed broken test
Fixed changing the start date on a non-repeating show
CC-5727 : History search range using incorrect timezone offset
Merge branch '2.5.x' of github.com:sourcefabric/Airtime into 2.5.x
CC-5728: Problem when removing repeat option and changing start date
Merge branch '2.5.x' of github.com:sourcefabric/Airtime into 2.5.x
CC-5727 : History search range using incorrect timezone offset (also Nowplaying)

sending the timestamp string back for nowplaying as well.
added error class to history page if end is < start.
Merge branch '2.5.x' of github.com:sourcefabric/Airtime into 2.5.x
CC-5727 : History search range using incorrect timezone offset

fixing show fetching times.