Polish translation updated
Added polars for Discus B and Arcus M
Update PTB
fix broken "ProjectedDistance" if optional cross track error output parameter is not provided.
  - this fix task speed & task coverage calculation
Optional FIXSNAIL for DrawTrail.  The trail is still changing colors too much.
Paragliding thermal exit timing changed from 9 to 15 seconds of straight flight, as a parameter.
Update changes, and this is version 4.1t
Advance to release candidate 5.0a0
Fix "AAT Mintime" parameter not visible in Glider Mode if "Optimized Route" is "ON"
Add missing LockTaskData in DetectFreeFlying
Prevent buffer overflow in DetectFreeFlying if language string is too long.
Merge branch 'freeflight' of https://github.com/brunotl/LK8000 into v50
Add internal AlphaBlend Function for All device
Screen orientation, save OS orientation on startup and restore it on shutdown.
  this is needed for allow use landscape mode with Oudie 2 device.