Support i18n/<lang>.json naming

[mcm1957]

Please implement support for i18n/.json naming

• npm run translate should detect whether admin/i18n/{lang}/translations.json or admin/i18n/.json format is used at a repo and use or create the corrrect files for this naming format

• npm run translate should provide an option to migrate form i18n/{lang}/translations.json to i18n/{lang}.json format. If reverse is required too should be discussed

[hombach]

great point Martin!
detection of the more developer friendly en.json instead of en\translation.json would be great!

Personaly I don't think that a migration-tool is necessary.

[UncleSamSwiss]

#281 Adds support for the new path and uses it as default path.
I'm not sure if we need to implement a migration tool. If the user wants to change it, they can do this manually.