fix: #3398914 Translation contains disallowed HTML

Fabiano Sant'Anarequested to merge
issue/captcha-3398914:3398914-translation-contains-disallowed-html into 2.x

The label of the PHP built-in font had the preview <img> inside the translatable string.

The image is now built outside t() with FormattableMarkup, and only "PHP built-in font" is translatable. The preview URL uses a : placeholder, which is meant for URLs.

Closes #3398914

Edited by Fabiano Sant'Ana

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