Internationalized "Go to a randomly selected page"

At this point a potential issue has been revealed. Now we produce
the final HTML via 2-level template expansion

1. Render parameterized messages
2. Render the HTML template

In which templates we should use double mustache "{{}}" (HTML-escaping)
tags and where we may use triple mustache "{{{}}}" (non-escaping) tags?

static/i18n/en.json

@@ -21,4 +21,5 @@
 	, "no-search-results": "The fulltext search engine is not available for this content."
 	, "library-button-text": "Go to welcome page"
 	, "home-button-text": "Go to the main page of '{{BOOK_TITLE}}'"
+	, "random-page-button-text": "Go to a randomly selected page"
 }

static/i18n/hy.json

@@ -11,4 +11,5 @@
 	, "404-page-heading" : "Սխալ հասցե"
 	, "library-button-text": "Գրադարանի էջ"
 	, "home-button-text": "Դեպի '{{BOOK_TITLE}}'֊ի գլխավոր էջը"
+	, "random-page-button-text": "Բացել պատահական էջ"
 }

static/i18n/qqq.json

@@ -22,4 +22,5 @@
 	, "no-search-results": "Text of the error page returned when search is attempted in a book without fulltext search database"
 	, "library-button-text": "Tooltip of the button leading to the welcome page"
 	, "home-button-text": "Tooltip of the button leading to the main page of a book"
+	, "random-page-button-text": "Tooltip of the button opening a randomly selected page"
 }