rename master levels

scripts/get-kanji-level.ts

@@ -112,7 +112,7 @@ export async function repairBeyond() {
     if (level < 71) {
       category = '61-70: 無限 INFINITY';
     } else if (level < 76) {
-      category = '71-75: 極度 BEYOND';
+      category = '71-75: 極端 BEYOND';
     } else {
       category = '76+: 熟達 MASTERY';
     }