Add rebase with merge commit merge style (#3844) (#4052)

Signed-off-by: Julian Tölle <julian.toelle97@gmail.com>

options/locale/locale_en-US.ini

@@ -868,6 +868,7 @@ pulls.no_merge_helper = Enable merge options in the repository settings or merge
 pulls.no_merge_wip = This pull request can not be merged because it is marked as being a work in progress.
 pulls.merge_pull_request = Merge Pull Request
 pulls.rebase_merge_pull_request = Rebase and Merge
+pulls.rebase_merge_commit_pull_request = Rebase and Merge (--no-ff)
 pulls.squash_merge_pull_request = Squash and Merge
 pulls.invalid_merge_option = You cannot use this merge option for this pull request.
 pulls.open_unmerged_pull_exists = `You cannot perform a reopen operation because there is a pending pull request (#%d) with identical properties.`
@@ -1013,6 +1014,7 @@ settings.pulls_desc = Enable Repository Pull Requests
 settings.pulls.ignore_whitespace = Ignore Whitespace for Conflicts
 settings.pulls.allow_merge_commits = Enable Commit Merging
 settings.pulls.allow_rebase_merge = Enable Rebasing to Merge Commits
+settings.pulls.allow_rebase_merge_commit = Enable Rebasing with explicit merge commits (--no-ff)
 settings.pulls.allow_squash_commits = Enable Squashing to Merge Commits
 settings.admin_settings = Administrator Settings
 settings.admin_enable_health_check = Enable Repository Health Checks (git fsck)