By not loading locale data into the main process we can considerably
reduce it's size. We the only thing we need access to in the main
process is the translation sets (used for the languages menu).
refactor the i18n code so that the locale data can only be loaded when
needed (in the renderer).
Wait until the `dom-ready` event has fired before opening up the
devtools window. This prevents the following error message showing up
multiple times when the app starts in dev mode:
> Extension server error: Operation failed: : has no execution context
See https://github.com/electron/electron/issues/12438Fix#499
Tom Kirkpatrick
Ben Woosley
Jack Mallers