Small patch fixing a couple of things.

Changelog

• Fixed so that animal mods which are missing a string for their id don't crash the game when added to a tank.
  
• Fixed so that animals swim again when hovering over them in the menu.
  

Regarding the first fix, it is still highly recommended that mods are created with string files to avoid populating the logs with errors. If you are using other people's mods, make sure you remember to add the .json file to the strings/en folder of the game.