typo3 for amount code example
Example: fluid format number
<f:format.number decimals="1" decimalSeparator="," thousandsSeparator=".">
423423.234
</f:format.number>
result: 423.423,2
<f:format.number decimals="1" decimalSeparator="," thousandsSeparator=".">
423423.234
</f:format.number>
result: 423.423,2