`i18n-tasks missing` does not respect explicitly defined locales

[jaredmoody]

When locales are set in the config, I'd expect only missing keys in those locales to be included when i18n-tasks missing is run.

Instead, any missing keys in any locales defined in my data.read path is returned, and to get the result I want, I have to run: i18n-tasks missing -l, passing in all of the locales again.

This seems like a bug to me, but I want to confirm before I submit a PR.

Thanks!

[davidwessman]

I'll leave this decision to @glebm

[glebm]

Yeah, sounds like a bug. Data should be filtered if the locales are configured explicitly. PR welcome!