Update notes for v0.18.58

Hi folks! This is a very small patch with a couple hotfixes for the Travel Update which went up yesterday.

These are:

• Fixed subscribers falling off vehicle depot platforms if they noticed a new quest giver NPC nearby.
  
• Added some extra safety checks in pathfinding, to cope with the destruction of buildings while a pathfinding operation was ongoing in a background thread.
  
• Converted a few minor errors from being treated as fatal to merely outputting a message to the game's log.
  
• Updated the German localisation data.
  

Thanks so much for all the support and feedback, everyone! -T