CrownIn <-> GitLab integration documentation

Documentation on how to re-create the GitLab Integration in CrowdIn.

doc/development/i18n/merging_translations.md

@@ -53,3 +53,18 @@ and delete the
 
 This might be needed when the merge request contains failures that
 have been fixed on master.
+
+## Recreate the GitLab integration in CrowdIn
+
+NOTE: ***Note:**
+These instructions work only for GitLab Team Members.
+
+If for some reason the GitLab integration in CrowdIn does not exist, it can be
+recreated by the following steps:
+
+1. Sign in to GitLab as `gitlab-crowdin-bot` (If you're a GitLab Team Member, find credentials in the GitLab shared  [1Password account](https://about.gitlab.com/handbook/security/#1password-for-teams)
+1. Sign in to Crowdin with the GitLab integration
+1. Navigate to Settings > Integrations > GitLab > Set Up Integration
+1. Select `gitlab-org/gitlab` repository
+1. On `Select Branches for Translation`, select `master`
+1. Ensure the `Service Branch Name` is `master-i18n`