The directory structure of i18n is as follows:
- i18n
|__ AA.yml
|__ BB.yml
|__ JavaIsland
|__ AA.yml
All files in i18n ending with .yml will be collected to common.en.json/common.zh_hans.json/..., which usually contains general purpose
i18n texts, e.g. for website UI.
Directories in i18n will be searched recursively, in which the .yml will be collected as JavaIsland.en.json/JavaIsland.zh_hans.json/...