Fix translation of license tier on billings page

Related issue link: https://jihulab.com/gitlab-cn/gitlab/-/issues/1660

What does this MR do and why?

Fix translation of license tier on billings page.

Bug points

• inappropriate name of GitLab.com
• License tier name of Ultimate without i18n support
• hard code with 旗舰试用版
• hard code with 免费版

Screenshots

Before

en	zh_CN

After

en	zh_CN

cc EM @prajnamas

About the translation of the introduction of plans, See #1682