Crash Fixes and a few new Things

[NEW] Include current regions in "location" payload #523
[NEW] use MQTT V5 library
[NEW] Include desc in _type=beacon messages #521
[NEW] translation (PL) update

[FIX] show matching files when selecting certificates only
[FIX] Crash in TodayViewController on iOS 9.3.5 iPhone4S #528
[FIX] Crash when accessing Address Book #529
[FIX] Crash when requesting reportLocation #527
[FIX] Crash in ConnectionType #526
[FIX] update lastUsedLocation immediately