refs https://github.com/TryGhost/Team/issues/668
Since we no longer store price data in the settings we must use the api
to read the stripe prices for the default price, so that we can maintain
backwards compatibility for the `@price` data in themes.
- when activating a theme, we need to load the current locale
- this request used to be buried deep in the themeI18n init call
- now we surface it in the bridge and pass it down, which is closer to what we want to do with eventually initialising the frontend
with everything it needs up front (or not initialising it, if it isn't needed)
- in the related helpers we depend on the site.locale value instead of proxy -> themeI18n -> settingsCache drastically simplifying the code and removing deep requires
- site.locale is updated via middleware and can be relied upon
- preparation for using DI instead of requires, so we can move this out of Ghost
- have done this for both the main i18n and theme i18n file
- refactored the constructor
refs: bf0823c9a2
- continuing the work of splitting up the theme service into logical components
- this is where it starts to get fiddly as the getActive function in themeService index is required across the frontend/backend mostly due to its use in the getApiVersion method
- for now left one usage of the getActive method in place in ghost-locals middleware ready for the next phase of the refactor, which will move some of the themeService index into a shared location
