[TYPO3] zero before point

[servis JiriMikula.cz]

Hi,

my problem - text in the RTE "size 0,35 mm" is converted in FE to "size
,35 mm" or "Class 1, Class 0, xxxxxxyyyyzzz" to "Class 1, Class ".
Any ideas?

Typo3 v3.8.1, HTML Area 1.1.3

Thanks.

Jíra
-- JiriMikula.cz