Update Mojang translations to 1.8.

Updates the included Mojang translations for Minecraft 1.8 so we can use the new translations in the console, for example the usages of the new commands.

### Example:
```java
sender.sendMessage(new TranslatableComponent("commands.generic.usage", new TranslatableComponent("commands.title.usage")));
```
Currrently this will print the following:
```
Usage: commands.title.usage
```
But actually it should print this:
```
Usage: /title <player> <title|subtitle|clear|reset|times> ...
```