Localization update : de, pt (to 78), da,fr,nl,ru,zh_HL/TW (to 78.8)

- German and Portuguese updated to 78
- All other languages already available updated to 78.8, that mostly
include achievements.
Gold pan drops nugget item on success, so that success is more obvious.
Refactored metal type determination to make planned chunk-based metal drops easier.
Localization : da and fr, typo fix and up to 78.9
The firepit now properly heats the bottom slots which should properly allow for liquid metal molds
Fixed rounding error when checking for freshwater at the players feet for thirst restoration.
Correct invalid plum sapling drops from 78.8, saving worlds with the invalid sapling items
Merge pull request #469 from upthorn/PanTest

Pan test
Merge pull request #470 from upthorn/PlumFixFixFix

Plum fix fix fix
Merge pull request #466 from aliceingame/master

Localization update
When it is cold enough, snow should be rendered instead of rain when there is precipitation. However the game still seems to think that it's warm so it spawns water splash particles on top of solid surfaces.
Merge branch 'master' of github.com:Deadrik/TFCraft
Meals can no longer be put in the ingredient slots of food prep.