Given these are shown to the user, they should be translatable.

While we're at it, also set up the dialog to automatically retranslate
the dialog along with the combo boxes if it receives a LanguageChange
event.

We don't need to use an allocating container for these, given we know
the fixed amount of strings being used. This is just a waste of memory.

Keeps the individual initialization of the combo boxes logically separate.
We also shouldn't be dumping this sort of thing in the constructor
directly.