Enhancement: clean up solution choices containing digit names replaced by digit literals in unrelated words

[blmage]

This can be observed for example in Turkish solutions (hiçbir replaced by hiç1):

[R0M4N0F5K7]

I don't know if this is relevant, but they are not completely unrelated. I noticed those numbers in the Turkish course too and they appear when the number in Turkish would be the same pronunciation (and spelling) as the replaced part. So in your example about "bir" is replaced with "1" because "one" is "bir" in Turkish. It's weird though how answers like these are excepted in Turkish, but I can see where they come from. It's exactly like test-message-code; like typing "I'm l8", "what's up m8", "been there be4" or "sk8board", so it somewhat makes sense, but still it seems weird to me that it is so widely excepted in a language learning course.