Add plugin translation system

shared/models/plugins/plugin-package-json.model.ts

@@ -1,5 +1,9 @@
 import { PluginClientScope } from './plugin-client-scope.type'
 
+export type PluginTranslationPaths = {
+  [ locale: string ]: string
+}
+
 export type ClientScript = {
   script: string,
   scopes: PluginClientScope[]
@@ -20,4 +24,6 @@ export type PluginPackageJson = {
   css: string[]
 
   clientScripts: ClientScript[]
+
+  translations: PluginTranslationPaths
 }

shared/models/plugins/plugin-translation.model.ts

@@ -0,0 +1,5 @@
+export type PluginTranslation = {
+  [ npmName: string ]: {
+    [ key: string ]: string
+  }
+}