I don't completely understand the problem yet (sorry) - could you provide a concrete example which has problems?

Parameter $1 may take many values. For example: $1 can be "donation amount", "email address", "first name", "last name"... (complete list at http://translatewiki.net/w/i.php?title=MediaWiki:Donate_interface-error-msg-field-correction/qqq&oldid=4586899)

The problem is that translation may vary depending on the value of $1. In Galician, for example, the message can take to wordings:
*Por favor, corrixe os erros no teu $1
*Por favor, corrixe os erros na túa $1

Being one or another depends on the grammatical gender of the word which will be shown instead of "$1". Example:
*Por favor, corrixe os erros no teu nome ($1 = name)
*Por favor, corrixe os erros na túa cidade ($1 = city)

I can't provide a concrete example, because I would have to specify the phrase with all the possible values for $1.

Ah, thanks a lot for explaining, understood now.

I have translated the message as follows:

Please correct the errors in the following field: $1

I think that the meaning is not lost and we just skip the problem. Maybe it would be a good idea to add this suggestion in the documentation to help other users.

Hey @Tolino am I reading this right that you were able to resolve it?

The workaround that I explained in my previous message (slightly changing the message definition) avoids the problem.

So you can mark this bug as resolved, I suppose.