Project-based Knowledgebase

[I18N] 
* Updated Japanese localization
* Updated German localization

[DOCS] 
* Updated README to include clear upgrade process from v2.3.0 to v3.0.0

[XXX] 
* "Properly" include dynamic components (in init.rb) using ActionDispatch::Reloader.to_prepare
[BUG] 
* Fixed an issue with uninitialized plugin settings causing crashes