Remove duplicated locale entries

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See: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12262#note_32816244

@reprazent:

Remove the translations from the config/locale/*.yml that we don't need?

We don't need to remove the files entirely, because there's some GitLab specific strings in there that we'd like to keep:

• The pagination translations
• Some validation messages
• The format of the timeago tooltip