Fixed several issues found by @Gigantoherceg and @joshwells17gh. One of the bugs was very serious and some players could lose their progress because of it. Sorry about that.

Release notes v0.15.3

Fixes:

• game did not save the player's progress when certain conditions were met;
  
• engines explode on launch on some laptop configurations;
  
• improved planet generation perfomance when rocket is on the launchpad and player quickly turns the camera;
  
• missing localizations string and typos in some places.