Fix i18n on signup spec
What does this MR do and why?
Update the copy in _signup_box.html.haml_spec.rb
: add a period .
.
Due to the missing period, it cannot be translated correctly by i18n, which ultimately causes the JiHu test to fail: https://jihulab.com/gitlab-cn/gitlab/-/jobs/12741667
This small flaw was introduced by !138654 (merged)
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Edited by Zhiyuan Lu