Since we are using the react-i18n babel loader plugin, useI18n can only
be used once per file. Also we have to remember to add the istanbul
ignore next comment each time we use it. By moving this to a common
file, it can be easily copied and pasted when a new submodule is
created and we don't have to remember the rules when calling it.
This replaces the delete notification with a new alert dialog. This
makes for better keyboard interaction and forces the user to make a
decision before doing anything else.
Also fixes closing the editor before deleting the file.
David Lechner