Translate current side before checking for "next side".

vassal-app/src/main/java/VASSAL/build/module/PlayerRoster.java

@@ -771,7 +771,7 @@ protected String promptForSide() {
     // Common names for Solitaire players (Solitaire, Solo, Referee) do not count as "real" player sides, and will be skipped.
     // If we have no "next" side available to offer, we stay with the observer side as our default offering.
     boolean found = false;       // If we find a usable side
-    final String mySide = getMySide(); // Get our own side, so we can find the "next" one
+    final String mySide = translateSide(getMySide()); // Get our own side, so we can find the "next" one
     final int myidx = (mySide != null) ? sides.indexOf(mySide) : -1; // See if we have a current non-observe side.
     int i = (myidx >= 0) ? ((myidx + 1) % sides.size()) : 0;   // If we do, start looking in the "next" slot, otherwise start at beginning.
     for (int tries = 0; i != myidx && tries < sides.size(); i = (i + 1) % sides.size(), tries++) { // Wrap-around search of sides