Renamed Super-Easy difficulty to Assisted difficulty.

"Super-Easy" isn't a particularly problematic name, but "Assisted"
is more descriptive of what the difficulty mode is for (to assist
players who have trouble playing on easy mode).

src/game.c

@@ -2495,8 +2495,8 @@ void game_getDifficultyText(char *dest, int difficulty)
 	switch (difficulty)
 	{
 		case DIFFICULTY_SUPEREASY:
-			/// DIFFICULTY_SUPEREASY
-			strcpy(dest, _("Super-Easy"));
+			/// DIFFICULTY_SUPEREASY (Assisted)
+			strcpy(dest, _("Assisted"));
 			break;
 		case DIFFICULTY_EASY:
 			/// DIFFICULTY_EASY