The plain-text versions of the mail (all languages) were HTML-escaping the page title and the personal message, so e.g. an apostrophe in the message was received as ' and the title could appear with HTML entities. They now use $doc.plainTitle and the raw message; the HTML versions use the escaped plain title for the link text.
Added SharePagePageTest (in xwiki-platform-sharepage-ui), which renders the subject, text and HTML of each language, and checks that all languages share the same Velocity directives and references, so that a fix made to one language can't be forgotten in the others.
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