Bump activesupport gem to 5.0.7 and i8n to 1.1.1
This matches what's in or will be shipping with CE (https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/23204/diffs).
This matches what's in or will be shipping with CE (https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/23204/diffs).