[PHP 7.2 compatibility] Fix unquoted strings
PHP 7.2 migration notes state that: > Unquoted strings that are non-existent global constants are taken to > be strings of themselves. This behaviour used to emit an E_NOTICE, > but will now emit an E_WARNING. In the next major version of PHP, an > Error exception will be thrown instead. There were various unquoted strings (used as array keys) in templates. As a consequence, those templates could not be rendered with PHP 7.2, and a 500 error was issued instead.
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