Add I18N support for contribution guidelines prompt

Baodongrequested to merge
gitlab-jh/jh-team/gitlab:fix/issue_new_i18n into master

What does this MR do and why?

Add I18N support for contribution guidelines prompt.

Screenshots or screen recordings

The effect after modifying the local po file:

Before After
截屏2022-07-25_17.20.26 截屏2022-07-25_17.17.59

How to set up and validate locally

Visit path: http://127.0.0.1:3000/<your-group>/<your-project>/-/issues/new

cc JH EM @prajnamas

Edited by Baodong

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