Merge branch '378546-sentence-casing-repository' into 'master'

Update sentence casing in "Repository" menu items

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/113401



Merged-by: Paul Slaughter <pslaughter@gitlab.com>
Approved-by: Austin Regnery <aregnery@gitlab.com>
Approved-by: Tetiana Chupryna <tchupryna@gitlab.com>
Approved-by: Paul Slaughter <pslaughter@gitlab.com>
Co-authored-by: Lukas Eipert <leipert@gitlab.com>