Not a legal xml character error during text editing

[watery]

After changing some labels under the Display section I encountered this error upon save:

The data "Nový používateľský účet vytvoríte vyplnením tohto formulára. Po vyplnení formulára môete nastaviť nové heslo a nastavenie bude ukončené." is not legal for a JDOM CDATA section: 0x0017 is not a legal XML character.

it seems to be caused by the text there: https://github.com/pwm-project/pwm/blob/590d24eba6ea77e620d3bc8675913bfd6b3dbd97/server/src/main/resources/password/pwm/i18n/Display_sk.properties#L79