I imagine they meant odd as in weird or unusual, not the numerical sense

Silvermyth is right, I think, it's not the right flag. The German Empire refers to a period of time after the German Unification, which included Prussia. The German Empire collapsed in 1918, alongside the end of WWI, so it would be accurate for the game to use it. However, the flag here is depicting the Prussian Eagle in front of an iron cross. While both of these symbols were used a helluva lot, the flag itself is a simple tricolor of black, white, and red.

Or you can just carry the numbers over like anyone else who's ever learned basic subtraction.

That's correct. The m is there because the phrase would technically be je me appelle, which directly translates to "I call myself." However, the French like their language to be fluid and pretty, so they drop that extra vowel syllable and just run together the two words, resulting in je m'appelle.

Okay, you got me there

Jesus Christ I hate myself

This is actually from a podcast (as I'm sure you can see) called Welcome to Night Vale that's absolutely spectacular, albeit completely bizarre and subtly horrifying at times. Really cool podcast though, if you can handle some weirdness. And gay weirdness.