Update en.yml
Closes #1924
isolate gems into build/dependencies, do not use any system gems
cleanup using ternary operator
support more Java List & Map concrete classes, fix for Java 8 Map#merge JRuby bug, added specs
persistent queue gems
use persistent queue
added messagepack & marshal serializers
json caching
new Mmap::SizedQueue class name
removed Marshal and MessagePack and fixed Json
basic queue persistence & serializing spec
update required versions