@ohif/i18n: Fix issues with exports and update docs (#598)

* update i18n version -- already published

* update ohif/i18n version and add modules

* update ohif/i18n version

* update translating documentation

* replace addLocales method and exported modules

* lock files

* Update index.js

* fix(@ohif/i18n): export custom methods in the main i18n object

`initI18n`, `addLocales` and `T` are now being exported inside the main `i18n` object.

* remove unecessary dependencies

* update vtk-extension lock file

extensions/ohif-i18n/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@ohif/i18n",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "description": "OHIF extension for internationalization",
   "author": "OHIF",
   "license": "MIT",