Switching language causes Java PXs not to work

Hi, I have this problem: a lot of my Java PXs read or write into fields referring directly to the field name. If I change the language the PX doesn't find the field anymore and it throws exceptions.

I know that there's a lot of instructions referring to the APIname of the fields, but I wasn't able to find all the ones I needed, so I'm asking: is there a way to use the user selected language as a parameter so I can add instructions at the beginning of my java code like "if language is Italian do this, if language is English do this, etc..". This would be really really helpful.