This is basically the same issue as https://www.drupal.org/node/807126 that was filed against the D6 branch of ImageField. That issue was closed as "fixed" by @quicksketch by pointing to the ImageField Tokens module:
Now with Tokens in core, it makes sense to take advantage of them and use them where possible.
PS: should support transliteration once in core (#904)
PR by @BWPanda: https://github.com/backdrop/backdrop/pull/3068
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