Disabling i18n for exception messages


I’m using ‘language’=>‘fa_ir’ in the config file to show some form messages in my own language. but I don’t want exception messages to be translated too!

The exception messages are more convenient in english and there’s no need to translate them. plus persian script is right to left and when it’s mixed with english words the whole sentence will look messed up:

what I get is this:

what it should be is this:

is there any way to disable translating this message at all?