Currently the text wall signs are labeled with the position of the letter in the alphabet -- why not simply the letter itself? Doing that conversion adds nothing to the game, just makes them needlessly complicated to use. (I am assuming here that you're including the Latin alphabet for all regions -- if not it might be a tad more complex but still no reason to not label a letter with a letter in the respective language)

Same for the numbers: they are indexed off by one -- 0 is 1, 1 is 2 etc. Please?