Writer localized function names

Writer up to 4.4.7 used localized function names for non-english versions.
After update to 5.0.4 all my ODTs with formulas are showing errors caused by using localized function names. Formulas need to be modified to use English function names to make them work.
I can’t find an option to switch between Localized and English formula names in Writer (such option in available for Calc). Version 5.1.0 the same as 5.0.4.
Am I missing something, or is it a bug/feature of the 5.x branch?