Fix missing prefixes for localized abbreviations

[DiSnider]

$prefixIndex variable shouldn't be incremented while enumerating by $unit.Localization because in that case for second and for all the next cultures abbreviation will be taken from the subsequent prefix index that is wrong.

[angularsen]

Great, thanks!
Next time, it would be good if you could run generate-code.bat and push the regenerated code files too. No biggie, just helps get an overview of the complete changes. I did verify locally and will push to master separately.