chore: release 2.8.0

[github-actions[bot]]

:robot: I have created a release *beep* *boop*

2.8.0 (2023-02-14)

Features

• add support for changing languages without restarting app (#276) (5227009)

Bug Fixes

• fix orientation issues on iPad (#281) (714bf79)

This PR was generated with Release Please. See documentation.

[github-actions[bot]]

:robot: Release is at https://github.com/guoyingtao/Mantis/releases/tag/v2.8.0 :sunflower: