add localization support

[ivanzhang]

may be i can support when i figure out all editorJS parts, like image plugin, trans "select a image" to "选择图片"

[maxeckel]

Hey @ivanzhang,

this is a really good enhancement. Actually that is already possible by publishing the JS assets where you can control everything about EditorJS, but that of course also moves the dependency management of EditorJS to your side. I really think that this should be supported by the package and I'll have a look at how it could be supported.