Fix Pipeline: Update i18n string with "."

What does this MR do and why?

1. 为注册页面的文案增加空格和句号

Failed job: https://jihulab.com/gitlab-cn/gitlab/-/jobs/12741592

Upstream 把这条文案加上了一个空格和一个句号（Upstream MR）。极狐这边同步一下就好了。

2. 暂时跳过 "_signup_box.html.haml_spec.rb"

Failed job: https://jihulab.com/gitlab-cn/gitlab/-/jobs/12741667

Upstream 的这个 Spec 文案没有更新，缺少一个句号，导致 i18n 失效，没有翻译成极狐的文案，导致测试失败。

我已经在 Upstream 提交了 Fix MR（!144004），等合并后，再把这个跳过删除。

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