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Fix multiple strings in translations (|, space, CC, markdown, ...)

This removes one "|" in strings so only one "|" exists per string.

This adds missing space in "for%{term_element}".

This changes "CC" to "Credit Card". So translators don't have to figure out what "CC" is.

This changes "markdown" to "Markdown".

Remove "* * * * *" from translation. Seems this is never translated into something else.

Remove 3 spaces from " %{name},  confirm your email address now! " making it identical with an already existing string.

Remove extra spavce in "check out %{notificationLinkStart} notification emails%{notificationLinkEnd}".

Closes #340195, #340138, #340133, #340129, #340675, #341196

See merge request gitlab-org/gitlab!70182