Translate GitLab to Urdu

GitLab supports internationalization and is being translated into many languages at https://translate.gitlab.com. We should support translating GitLab to Urdu.

Proposal

Two steps required:

1. Enable translation to Urdu in Crowdin
2. Enable Urdu as a language option in GitLab

Links

https://gitlab.com/gitlab-org/gitlab-ce/issues/4012