Bug 988519 - [Camera] Improve localization
Bug 987418 - Update copy in fxa system app
Update l10n keys for new strings
Revert "bug 961009, stop exposing fxa to l10n until it's done"

This reverts commit 2c7d5507e640b7f495d63308ef5f089eee80022e.
Rename locales file per comment 1 in bug 961009