Adding IsTranslationExist() to ICatalog interface

[pgpaccuratech]

I'm writing a program where I have to read multiple .mo files (catalogs), and based on the order they are imported, I have to find the correct translation.

As the current ICatalog does not expose the IsTranslationExist() I have to use Catalog over the interface. This makes unit testing harder than it has to be 😊

Is it possible to add the IsTranslationExist() to the ICatalog interface?`

/peter