There's no way to do this. Instead, make a Default.png with no text.
Edit: I stand corrected. Just tried Alladinian's method and it worked. I'll leave my answer, as it's a useful technique to know.
You can do this pretty easily in Photoshop by selecting a square, then copying it and pasting it over the text. Use Marquee to select a square of your graphic (say an empty part of a navigation bar). Then hit "v" for the move tool. Use cmd-opt and move the square a little to the left, then cmd-opt-shift so that it doesn't move up or down. Move the square over the text and let go of the mouse button. Repeat as necessary.
If you want to see how Apple handles multi-language splash screens, open Maps or Mail. They have a Default screen with no text, then the text appears (in whatever language) when the app has loaded.
