Internationalise Group Page

Resources

As part of our on-going effort to internationalise GitLab in https://gitlab.com/gitlab-org/gitlab-ce/issues/4012

List of areas to translate

• Translation of Group page (including subgroups)
• Tooltip on group privacy/visibility icon
• Leave Group button
• Notification drop-down
• Projects & Subgroups label
• Filter text input placeholder
• Dropdown filter labels
• Timeago on project list
• Project list privacy/visibility icon tooltip
• Subgroup list privacy/visibility icon tooltip
• Pagination widget

Out of scope

• CI widget icon (to be done by ~CI team)