Naming Your Stuff
Making names for items no longer requires the use of LanguageRegistry. Instead, to register names, you must make a .lang file (a text file with .lang as the extension) and place it inside assets/modid/lang. The name of the file corresponds to the language you're making it for, so a US english file would be name en_US.lang.
Item Names
item.myFirstItem.name=My First Item :O
Block Names
tile.myFirstBlock.name=My First Block
Creative Tab Names
itemGroup.myFirstTab.name=My First Tab
Entity Names
entity.myFirstMob.name=My First Mob
Key Binding Names
key.myFirstKey=My First Key
key.categories.myFirstKeyCategory=My First Key Category
Death/Damage Source Names
death.attack.myFirstDeath=My First Death
Item Names
item.myFirstItem.name=My First Item :O
Block Names
tile.myFirstBlock.name=My First Block
Creative Tab Names
itemGroup.myFirstTab.name=My First Tab
Entity Names
entity.myFirstMob.name=My First Mob
Key Binding Names
key.myFirstKey=My First Key
key.categories.myFirstKeyCategory=My First Key Category
Death/Damage Source Names
death.attack.myFirstDeath=My First Death